A269010 Number of nX7 binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

38, 696, 18210, 390064, 8134304, 164351184, 3258530608, 63679868768, 1230707111424, 23573013881888, 448188039743360, 8468276406290880, 159151109503787520, 2977237536021550208, 55469798154343791232

Offset

1,1

Comments

Column 7 of A269011.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 60*a(n-1) -1352*a(n-2) +13344*a(n-3) -35948*a(n-4) -311480*a(n-5) +1985472*a(n-6) +1821840*a(n-7) -31021776*a(n-8) +4125984*a(n-9) +251967152*a(n-10) -46853056*a(n-11) -1173410880*a(n-12) -138650624*a(n-13) +2912101888*a(n-14) +1295316992*a(n-15) -3360870400*a(n-16) -2339016704*a(n-17) +1368141824*a(n-18) +1168457728*a(n-19) -291553280*a(n-20) -245170176*a(n-21) +45023232*a(n-22) +19922944*a(n-23) -4194304*a(n-24) for n>25

Example

Some solutions for n=3
..0..1..0..1..0..0..1. .1..0..1..0..0..1..0. .1..0..1..0..0..1..0
..0..1..0..0..0..0..1. .1..0..0..0..0..0..0. .0..0..0..0..1..0..0
..0..0..0..0..0..1..0. .1..0..1..1..0..0..0. .1..0..1..0..0..0..0

Crossrefs

Cf. A269011.

Sequence in context: A089271 A195912 A240425 * A010954 A035714 A161651

Adjacent sequences: A269007 A269008 A269009 * A269011 A269012 A269013

Keyword

nonn

Author

R. H. Hardin, Feb 17 2016

Status

approved