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A297453 Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0 or 2 neighboring 1s. 1
8, 57, 285, 1677, 9774, 55713, 321030, 1848151, 10625522, 61131830, 351682612, 2023019752, 11637747389, 66947610020, 385122792748, 2215463607635, 12744705917954, 73315348059589, 421754827819809, 2426192243526228 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A297457.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -2*a(n-2) +14*a(n-3) -69*a(n-4) +45*a(n-5) -13*a(n-6) +23*a(n-7) +3*a(n-8) +3*a(n-9) +2*a(n-10) -4*a(n-11)

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A297457.

Sequence in context: A143570 A296721 A283693 * A096711 A282394 A244201

Adjacent sequences:  A297450 A297451 A297452 * A297454 A297455 A297456

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2017

STATUS

approved

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Last modified June 7 02:48 EDT 2020. Contains 334836 sequences. (Running on oeis4.)