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A283568 Number of nX4 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
2, 72, 674, 6812, 60802, 528436, 4441052, 36589848, 296555892, 2373574616, 18804085974, 147722885964, 1152326125736, 8934988081564, 68923216977218, 529275667161388, 4048382091614590, 30857555674174468, 234469910144650842 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A283572.

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) -16*a(n-2) -148*a(n-3) +122*a(n-4) +8*a(n-5) -1218*a(n-6) +1236*a(n-7) +1851*a(n-8) -3776*a(n-9) +3314*a(n-10) +5408*a(n-11) -7569*a(n-12) -2532*a(n-13) +2620*a(n-14) +320*a(n-15) -256*a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283572.

Sequence in context: A187707 A163274 A030993 * A070775 A157061 A179957

Adjacent sequences:  A283565 A283566 A283567 * A283569 A283570 A283571

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 11 2017

STATUS

approved

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Last modified July 24 01:41 EDT 2021. Contains 346269 sequences. (Running on oeis4.)