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A301880 Number of nX4 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
5, 18, 58, 203, 673, 2340, 7883, 27175, 92411, 316916, 1082302, 3703582, 12666854, 43318597, 148204170, 506815629, 1733886818, 5929952262, 20285442903, 69382426261, 237332736304, 811785135443, 2776754678163, 9497916687371 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A301884.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +12*a(n-2) -2*a(n-3) -38*a(n-4) +a(n-5) +12*a(n-6) -a(n-8)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301884.

Sequence in context: A335551 A235612 A000340 * A034567 A133648 A284968

Adjacent sequences: A301877 A301878 A301879 * A301881 A301882 A301883

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 28 2018

STATUS

approved

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Last modified November 28 00:05 EST 2022. Contains 358406 sequences. (Running on oeis4.)