VOOZH about

URL: https://oeis.org/A221660

⇱ A221660 - OEIS

login
A221660
T(n,k)=Equals one maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..2 nXk array.
4
1, 2, 1, 4, 8, 1, 8, 37, 32, 1, 16, 172, 323, 128, 1, 32, 771, 3322, 2735, 512, 1, 64, 3392, 29939, 58710, 22683, 2048, 1, 128, 14569, 254682, 1016831, 989020, 185563, 8192, 1, 256, 61210, 2078316, 16705642, 33166449, 16261308, 1503659, 32768, 1, 512, 252491
OFFSET
1,2
COMMENTS
Table starts
.1......2........4..........8..........16..........32..........64........128
.1......8.......37........172.........771........3392.......14569......61210
.1.....32......323.......3322.......29939......254682.....2078316...16737048
.1....128.....2735......58710.....1016831....16705642...268216870.4294510063
.1....512....22683.....989020....33166449..1072967251.34355764004
.1...2048...185563...16261308..1068217665.68708241498
.1...8192..1503659..263988148.34258980206
.1..32768.12103019.4256750870
.1.131072.96951211
.1.524288
.1
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..0..1..0....1..0..1..0....0..1..0..1....1..1..0..1....0..0..1..1
..1..0..1..0....0..0..0..1....1..1..1..1....1..1..1..0....1..0..0..0
..0..1..1..1....1..0..0..1....1..1..1..1....0..1..1..0....1..1..1..0
CROSSREFS
Column 2 is A004171(n-1)
Column 3 is A221059
Column 4 is A221060
Column 5 is A221061
Row 1 is A000079(n-1)
Row 2 is A221063
Sequence in context: A383410 A330787 A128412 * A221062 A220916 A221632
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Jan 21 2013
STATUS
approved