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A316689 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 1
8, 5, 9, 23, 44, 125, 313, 773, 1964, 4948, 12456, 31393, 79085, 199281, 502100, 1265024, 3187400, 8030877, 20234253, 50981805, 128452324, 323644732, 815446408, 2054575929, 5176652093, 13042948233, 32862647844, 82799810200, 208620089912 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A316693.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +5*a(n-3) +a(n-4) -2*a(n-5) -6*a(n-6) -4*a(n-7) for n>11

EXAMPLE

Some solutions for n=5

..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0

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

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

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

..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0

CROSSREFS

Cf. A316693.

Sequence in context: A070473 A154210 A198996 * A087462 A168204 A193681

Adjacent sequences:  A316686 A316687 A316688 * A316690 A316691 A316692

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 10 2018

STATUS

approved

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Last modified February 23 00:28 EST 2020. Contains 332157 sequences. (Running on oeis4.)