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A268994 Number of nX7 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once. 1
72, 2037, 57287, 1506570, 38241770, 946498448, 22995344760, 550731432312, 13040291111728, 305911647779632, 7121104059933536, 164688437285444064, 3787495455529375808, 86684333527271203264, 1975573336154420926848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A268995.

LINKS

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

FORMULA

Empirical: a(n) = 68*a(n-1) -1804*a(n-2) +24560*a(n-3) -195400*a(n-4) +974752*a(n-5) -3171360*a(n-6) +6871936*a(n-7) -9999248*a(n-8) +9740096*a(n-9) -6250176*a(n-10) +2552576*a(n-11) -621824*a(n-12) +79872*a(n-13) -4096*a(n-14) for n>16

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A268995.

Sequence in context: A263974 A344029 A187303 * A347566 A277532 A341556

Adjacent sequences:  A268991 A268992 A268993 * A268995 A268996 A268997

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2016

STATUS

approved

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Last modified September 18 12:13 EDT 2021. Contains 347527 sequences. (Running on oeis4.)