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A283575 Number of 4Xn 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element. 1
0, 68, 1108, 6812, 67892, 509952, 3890056, 29428836, 214600036, 1561753984, 11203805186, 79697223948, 563151495500, 3952776211644, 27603742610922, 191869394908352, 1328251534591608, 9162408587486912, 63001467075539154 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A283572.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +34*a(n-2) +48*a(n-3) -561*a(n-4) -2288*a(n-5) -5234*a(n-6) -5692*a(n-7) -8384*a(n-8) +4044*a(n-9) -3814*a(n-10) +27880*a(n-11) -6865*a(n-12) +31280*a(n-13) -24250*a(n-14) +14500*a(n-15) -21025*a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283572.

Sequence in context: A251939 A163728 A168179 * A231060 A245875 A329444

Adjacent sequences:  A283572 A283573 A283574 * A283576 A283577 A283578

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 11 2017

STATUS

approved

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Last modified September 22 23:50 EDT 2021. Contains 347609 sequences. (Running on oeis4.)