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A268786
Number of nX5 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.
1
10, 131, 1144, 9085, 67100, 477128, 3295246, 22302699, 148575958, 977609634, 6368239274, 41140907455, 263939673228, 1683296018391, 10680625988516, 67468330344536, 424526386272378, 2661981983940811, 16640406499054332
OFFSET
1,1
COMMENTS
Column 5 of A268789.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +41*a(n-2) +54*a(n-3) -509*a(n-4) -2182*a(n-5) -2830*a(n-6) +1766*a(n-7) +7914*a(n-8) +2584*a(n-9) -10583*a(n-10) -6092*a(n-11) +11506*a(n-12) +5348*a(n-13) -11688*a(n-14) -620*a(n-15) +9251*a(n-16) -4462*a(n-17) -3137*a(n-18) +4774*a(n-19) -2365*a(n-20) +338*a(n-21) +198*a(n-22) -106*a(n-23) +12*a(n-24) +4*a(n-25) -a(n-26)
EXAMPLE
Some solutions for n=4
..0..0..0..0..0. .0..1..1..0..0. .0..0..0..0..0. .0..1..0..0..1
..0..1..0..0..1. .0..0..0..0..1. .0..0..1..0..1. .0..0..0..1..0
..0..0..1..0..0. .0..1..0..0..0. .1..0..0..0..0. .0..0..0..0..1
..0..0..1..0..0. .0..0..1..0..1. .1..0..0..0..1. .1..0..1..0..0
CROSSREFS
Cf. A268789.
Sequence in context: A113386 A302615 A281395 * A284196 A286723 A239814
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2016
STATUS
approved