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A223581
Number of nX4 0..3 arrays with antidiagonals unimodal.
1
256, 65536, 10240000, 1331200000, 173056000000, 22497280000000, 2924646400000000, 380204032000000000, 49426524160000000000, 6425448140800000000000, 835308258304000000000000
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OFFSET
1,1
COMMENTS
Column 4 of
A223585
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..210
FORMULA
Let U(z) = (z^6+15*z^5+115*z^4+405*z^3+964*z^2+660*z+720)/720
a(n) = U(min(n,4))^(max(n,4)-min(n,4)+1) * product{ U(i)^2 , i=1..(min(n,4)-1) }
a(n) = 130*a(n-1) for n>3
EXAMPLE
Some solutions for n=3
..0..0..2..1....0..0..3..0....0..2..2..1....0..0..2..0....0..0..0..2
..0..1..3..1....0..3..2..1....0..0..1..2....0..2..1..1....0..3..3..3
..1..2..3..3....1..1..3..1....0..1..1..1....0..3..0..1....1..2..0..3
CROSSREFS
Sequence in context:
A188909
A189110
A223803
*
A133752
A144322
A223266
Adjacent sequences:
A223578
A223579
A223580
*
A223582
A223583
A223584
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Mar 22 2013
STATUS
approved
