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A283693 Number of 3Xn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors. 1
8, 57, 264, 1521, 8687, 47829, 268285, 1503392, 8399236, 46998162, 262952663, 1470846540, 8228361722, 46031489681, 257506370211, 1440540994224, 8058660343663, 45081605428482, 252194893203897, 1410825055629845 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A283691.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +3*a(n-2) +15*a(n-3) -72*a(n-4) -21*a(n-5) +45*a(n-6) +96*a(n-7) +13*a(n-8) -115*a(n-9) +50*a(n-10) -14*a(n-11)

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A283691.

Sequence in context: A317694 A143570 A296721 * A297453 A096711 A282394

Adjacent sequences:  A283690 A283691 A283692 * A283694 A283695 A283696

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 14 2017

STATUS

approved

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Last modified May 18 08:30 EDT 2022. Contains 353785 sequences. (Running on oeis4.)