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A269074 Number of nX7 binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once. 1
72, 1204, 27042, 542112, 10778640, 210476400, 4064720816, 77785162880, 1477636398784, 27897108860960, 523921783242624, 9794822341611072, 182387895832407680, 3384281324193062016, 62600172035227164032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A269075.

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

..1..0..0..1..0..0..1. .0..1..0..1..0..0..1. .0..0..0..0..0..0..1

..0..0..1..0..0..0..0. .1..0..0..1..0..0..0. .1..1..0..1..0..0..0

..0..0..0..0..1..0..1. .0..0..0..0..0..1..0. .0..0..0..1..0..1..0

CROSSREFS

Cf. A269075.

Sequence in context: A269088 A168194 A249713 * A200556 A239423 A128800

Adjacent sequences:  A269071 A269072 A269073 * A269075 A269076 A269077

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 19 2016

STATUS

approved

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Last modified April 3 13:53 EDT 2020. Contains 333197 sequences. (Running on oeis4.)