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A303464 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 29, 170, 1033, 6369, 39098, 240109, 1476141, 9071642, 55751425, 342663945, 2106046874, 12944002597, 79556015733, 488963529146, 3005245731481, 18470721790257, 113523996378746, 697736565265309, 4288400399533821 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A303469.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -5*a(n-2) +20*a(n-3) -144*a(n-4) +72*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303469.

Sequence in context: A200069 A302803 A300806 * A301445 A198794 A258416

Adjacent sequences:  A303461 A303462 A303463 * A303465 A303466 A303467

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 24 2018

STATUS

approved

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Last modified December 6 10:24 EST 2021. Contains 349563 sequences. (Running on oeis4.)