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A316579 Number of n X 4 0..1 arrays with every element unequal to 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero. 1
2, 86, 338, 2477, 15200, 98828, 634867, 4075278, 26237510, 168609293, 1084646515, 6974198436, 44852048913, 288431335983, 1854858690411, 11928278590728, 76708676923189, 493300608838000, 3172331161527758, 20400722024621502 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A316583.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +25*a(n-2) +a(n-3) -115*a(n-4) -55*a(n-5) -137*a(n-6) -397*a(n-7) +493*a(n-8) +1679*a(n-9) +2306*a(n-10) -1347*a(n-11) -5981*a(n-12) +11404*a(n-13) -4662*a(n-14) -3084*a(n-15) +20613*a(n-16) -52182*a(n-17) +5114*a(n-18) -47834*a(n-19) +53055*a(n-20) +41052*a(n-21) -31326*a(n-22) +86594*a(n-23) -98376*a(n-24) +109294*a(n-25) -164081*a(n-26) +106291*a(n-27) -92312*a(n-28) +125199*a(n-29) -37844*a(n-30) +37542*a(n-31) -4929*a(n-32) -12369*a(n-33) +17284*a(n-34) -26356*a(n-35) +20186*a(n-36) -14606*a(n-37) +11238*a(n-38) -7304*a(n-39) +4348*a(n-40) -2428*a(n-41) +966*a(n-42) -464*a(n-43) +140*a(n-44) -32*a(n-45) +16*a(n-46) for n>48.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A316583.

Sequence in context: A303892 A305284 A304897 * A304593 A316379 A306139

Adjacent sequences:  A316576 A316577 A316578 * A316580 A316581 A316582

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 07 2018

STATUS

approved

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Last modified October 1 13:55 EDT 2022. Contains 357149 sequences. (Running on oeis4.)