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A303422 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 32, 252, 1985, 15647, 123337, 972168, 7662841, 60400282, 476088932, 3752642337, 29579189147, 233149966025, 1837741608616, 14485501658565, 114178052735590, 899977648952776, 7093830637396745, 55915203194889879, 440736480491065049 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A303421.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +4*a(n-2) +21*a(n-3) +18*a(n-4)

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A303421.

Sequence in context: A317520 A300203 A273053 * A301402 A303416 A007278

Adjacent sequences:  A303419 A303420 A303421 * A303423 A303424 A303425

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 23 2018

STATUS

approved

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Last modified August 1 22:36 EDT 2021. Contains 346408 sequences. (Running on oeis4.)