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A303796 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero. 1
8, 24, 30, 90, 231, 631, 1586, 4230, 11059, 29053, 75910, 199512, 522870, 1370889, 3593603, 9425485, 24711611, 64792085, 169885855, 445461189, 1167988296, 3062473985, 8029902757, 21054655960, 55205582288, 144750167082, 379538412292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A303800.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +4*a(n-3) +7*a(n-4) -12*a(n-5) -24*a(n-6) -17*a(n-7) -5*a(n-8) +11*a(n-9) +31*a(n-10) +43*a(n-11) +17*a(n-12) +12*a(n-13) -15*a(n-14) -16*a(n-15) -39*a(n-16) -24*a(n-17) +18*a(n-18) +26*a(n-19) +4*a(n-20) +7*a(n-21) -14*a(n-22) -32*a(n-23) +5*a(n-24) +7*a(n-25) -6*a(n-26) +a(n-27) +2*a(n-28) for n>32

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303800.

Sequence in context: A038524 A261394 A162829 * A175368 A000118 A096727

Adjacent sequences:  A303793 A303794 A303795 * A303797 A303798 A303799

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 30 2018

STATUS

approved

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Last modified May 28 03:59 EDT 2018. Contains 304733 sequences. (Running on oeis4.)