A268999 - OEIS

A268999

Number of 5Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

32, 379, 4083, 43512, 421450, 4097199, 38241770, 354861630, 3233293149, 29238488883, 261801167468, 2329097648405, 20588801089961, 181083224080162, 1585346158237184, 13824737077018333, 120130562347636272

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OFFSET

1,1

COMMENTS

Row 5 of A268995.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +97*a(n-2) +116*a(n-3) -2923*a(n-4) -10986*a(n-5) +4951*a(n-6) +72992*a(n-7) +36740*a(n-8) -223968*a(n-9) -159382*a(n-10) +423052*a(n-11) +256370*a(n-12) -539504*a(n-13) -176570*a(n-14) +450908*a(n-15) +6166*a(n-16) -217920*a(n-17) +57416*a(n-18) +45120*a(n-19) -25021*a(n-20) +562*a(n-21) +2089*a(n-22) -388*a(n-23) -31*a(n-24) +14*a(n-25) -a(n-26)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A268995.

Sequence in context: A250170 A125420 A163690 * A280602 A301321 A300496

Adjacent sequences: A268996 A268997 A268998 * A269000 A269001 A269002

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2016

STATUS

approved