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A302266 Number of 2Xn 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 4
2, 8, 29, 105, 384, 1405, 5135, 18766, 68589, 250693, 916272, 3348929, 12240187, 44737350, 163513041, 597632937, 2184322000, 7983600501, 29179707415, 106650542494, 389803024901, 1424712848861, 5207262571120, 19032314831801 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A302265.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +a(n-2) +4*a(n-3) +4*a(n-4)

EXAMPLE

Some solutions for n=5

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

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

CROSSREFS

Cf. A302265.

Sequence in context: A212385 A208973 A100477 * A011367 A220547 A261774

Adjacent sequences:  A302263 A302264 A302265 * A302267 A302268 A302269

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 04 2018

STATUS

approved

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Last modified October 22 14:44 EDT 2019. Contains 328318 sequences. (Running on oeis4.)