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A302674 Number of n X n 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
1, 3, 8, 20, 63, 453, 6311, 92889, 1847358, 65801890, 3339677315, 218906752065, 21593578996507, 3271858745091063, 693762002728416501, 208397398216895893003, 93110263365139995537485 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302680.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302680.

Sequence in context: A268042 A009436 A354519 * A108189 A148768 A110861

Adjacent sequences:  A302671 A302672 A302673 * A302675 A302676 A302677

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 11 2018

STATUS

approved

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Last modified September 26 23:44 EDT 2022. Contains 357051 sequences. (Running on oeis4.)