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A299670 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 2
4, 26, 94, 372, 1512, 6133, 24742, 100035, 404608, 1636222, 6616385, 26756052, 108199516, 437548895, 1769407046, 7155326538, 28935512224, 117012660592, 473188897749, 1913534302589, 7738164499878, 31292456968931, 126543945261462 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A299675.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -3*a(n-2) -12*a(n-4) -15*a(n-5) +20*a(n-6) +17*a(n-7) +32*a(n-8) -64*a(n-9) -5*a(n-10) +25*a(n-11) +77*a(n-12) +11*a(n-13) -27*a(n-14) -21*a(n-15) -14*a(n-16) -13*a(n-17) -4*a(n-18) for n>19

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A299675.

Sequence in context: A118285 A101166 A299003 * A299748 A300262 A359254

Adjacent sequences: A299667 A299668 A299669 * A299671 A299672 A299673

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2018

STATUS

approved

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Last modified January 26 17:44 EST 2023. Contains 359833 sequences. (Running on oeis4.)