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A283722 Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element. 1
0, 60, 1088, 15228, 196548, 2391696, 28103560, 322050940, 3622197748, 40156778920, 440103529194, 4778398401120, 51478875779886, 550962104490308, 5863716020439970, 62102879848049336, 654945091390069876 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A283726.

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) -a(n-2) -226*a(n-3) -1460*a(n-4) -2232*a(n-5) +1525*a(n-6) +22350*a(n-7) +39289*a(n-8) +13206*a(n-9) -146613*a(n-10) -259034*a(n-11) -136682*a(n-12) +488660*a(n-13) +810954*a(n-14) +302750*a(n-15) -834146*a(n-16) -986264*a(n-17) -173928*a(n-18) +495516*a(n-19) +329204*a(n-20) +4440*a(n-21) -35121*a(n-22) -16332*a(n-23) -13884*a(n-24) -5504*a(n-25) -1072*a(n-26) -320*a(n-27) -64*a(n-28)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283726.

Sequence in context: A305545 A056352 A056346 * A105252 A269138 A146347

Adjacent sequences:  A283719 A283720 A283721 * A283723 A283724 A283725

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 15 2017

STATUS

approved

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Last modified August 9 05:12 EDT 2020. Contains 336319 sequences. (Running on oeis4.)