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A302966 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 32, 154, 786, 3924, 19868, 100161, 505908, 2554201, 12898093, 65130456, 328890172, 1660800969, 8386586118, 42349950959, 213855666444, 1079912639341, 5453263882696, 27537493309346, 139056822182155, 702198983497508 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A302965.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +15*a(n-2) -11*a(n-3) -64*a(n-4) -10*a(n-5) +73*a(n-6) +15*a(n-7) -7*a(n-8) +4*a(n-9) -30*a(n-10) -9*a(n-11) +8*a(n-12) for n>13

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A302965.

Sequence in context: A302070 A302267 A113154 * A337367 A334323 A270161

Adjacent sequences:  A302963 A302964 A302965 * A302967 A302968 A302969

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 2018

STATUS

approved

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Last modified October 24 12:39 EDT 2021. Contains 348230 sequences. (Running on oeis4.)