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A302422 Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
3, 9, 11, 21, 51, 93, 207, 517, 1007, 2333, 5847, 11781, 27055, 66861, 137895, 314197, 766367, 1610429, 3649239, 8799333, 18772687, 42381645, 101181063, 218513269, 492148223, 1164905693, 2540589879, 5713965957, 13425837103, 29512490349 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A302427.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +10*a(n-3) -8*a(n-4) for n>9

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302427.

Sequence in context: A032671 A331029 A105949 * A032665 A331832 A032915

Adjacent sequences:  A302419 A302420 A302421 * A302423 A302424 A302425

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 07 2018

STATUS

approved

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Last modified May 24 11:51 EDT 2022. Contains 354033 sequences. (Running on oeis4.)