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A316285 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3, 6 or 8 king-move adjacent elements, with upper left element zero. 1
8, 49, 125, 354, 1372, 3933, 12454, 42946, 135396, 437859, 1454625, 4718224, 15398305, 50682956, 165816368, 543317768, 1785073445, 5856614373, 19223124004, 63151760399, 207409161018, 681297182756, 2238603218152, 7355417198037 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A316289.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -15*a(n-2) +22*a(n-3) -91*a(n-4) +194*a(n-5) -128*a(n-6) +198*a(n-7) -559*a(n-8) +288*a(n-9) +210*a(n-10) +102*a(n-11) -58*a(n-12) -534*a(n-13) +420*a(n-14) -139*a(n-15) +238*a(n-16) -200*a(n-17) +56*a(n-18) -24*a(n-19) +18*a(n-20) -4*a(n-21) for n>25

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A316289.

Sequence in context: A352179 A304468 A272713 * A018200 A306049 A317226

Adjacent sequences: A316282 A316283 A316284 * A316286 A316287 A316288

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 28 2018

STATUS

approved

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Last modified November 28 22:51 EST 2022. Contains 358421 sequences. (Running on oeis4.)