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A251322
Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock having one or two 1s.
1
220, 1982, 17216, 157312, 1405454, 12770802, 114913804, 1040818716, 9388632290, 84916233072, 766719557970, 6930512776886, 62601134362556, 565720424690948, 5110812449111474, 46181028008719378, 417235865422683956
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OFFSET
1,1
COMMENTS
Column 4 of
A251326
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) +67*a(n-2) -299*a(n-3) -1066*a(n-4) +4715*a(n-5) +3684*a(n-6) -22554*a(n-7) -2351*a(n-8) +42798*a(n-9) -2598*a(n-10) -36276*a(n-11) +3532*a(n-12) +14102*a(n-13) -1392*a(n-14) -2361*a(n-15) +222*a(n-16) +145*a(n-17) -11*a(n-18) -2*a(n-19)
EXAMPLE
Some solutions for n=4
..0..0..0..1..0....0..1..1..0..1....1..0..0..0..0....0..0..1..0..1
..0..1..0..0..1....0..0..0..0..0....0..0..1..0..1....1..0..1..0..1
..1..0..1..0..0....0..1..0..1..0....1..0..0..1..0....0..0..0..0..0
..1..0..0..1..1....1..0..1..0..0....1..0..1..0..1....1..1..1..0..1
..0..1..1..0..0....1..0..0..0..1....0..1..0..0..1....0..0..0..1..0
CROSSREFS
Sequence in context:
A241615
A180219
A233626
*
A257353
A211820
A215491
Adjacent sequences:
A251319
A251320
A251321
*
A251323
A251324
A251325
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Dec 01 2014
STATUS
approved
