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A303192 Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
3, 9, 12, 23, 62, 122, 305, 793, 1757, 4500, 11625, 27164, 68288, 174229, 418787, 1042345, 2631836, 6422387, 15922406, 39917606, 98193097, 243159537, 606853585, 1499009192, 3711839149, 9238182444, 22867354964, 56640304965, 140740151139 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A303197.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-2) +11*a(n-3) -15*a(n-4) +6*a(n-5) -10*a(n-6) +6*a(n-7) for n>11

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303197.

Sequence in context: A307201 A022379 A344720 * A261957 A261951 A308422

Adjacent sequences:  A303189 A303190 A303191 * A303193 A303194 A303195

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 19 2018

STATUS

approved

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Last modified June 20 04:43 EDT 2021. Contains 345157 sequences. (Running on oeis4.)