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A300374 Number of nX2 0..1 arrays with every element equal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 4
1, 3, 2, 10, 13, 42, 74, 188, 387, 885, 1937, 4275, 9526, 20871, 46566, 102205, 227355, 500590, 1110398, 2450549, 5426150, 11990298, 26526428, 58649475, 129706253, 286835657, 634286359, 1402736818, 3101877239, 6859804246, 15169348965 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A300380.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-2) +2*a(n-3) +a(n-5) -3*a(n-6) +a(n-7)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300380.

Sequence in context: A113980 A095675 A226442 * A256063 A006743 A091811

Adjacent sequences:  A300371 A300372 A300373 * A300375 A300376 A300377

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 04 2018

STATUS

approved

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Last modified May 23 12:38 EDT 2019. Contains 323514 sequences. (Running on oeis4.)