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A301965 Number of 3Xn 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
4, 13, 16, 25, 41, 74, 132, 239, 437, 800, 1468, 2697, 4957, 9114, 16760, 30823, 56689, 104264, 191768, 352713, 648737, 1193210, 2194652, 4036591, 7424445, 13655680, 25116708, 46196825, 84969205, 156282730, 287448752, 528700679, 972432153 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A301964.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-4) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A301964.

Sequence in context: A297363 A031208 A228137 * A191135 A268524 A032824

Adjacent sequences: A301962 A301963 A301964 * A301966 A301967 A301968

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 29 2018

STATUS

approved

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Last modified January 29 19:50 EST 2023. Contains 359926 sequences. (Running on oeis4.)