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A302145 Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
1, 1, 4, 17, 289, 15999, 1728734, 476725579, 338788296901, 600144995821877, 2721126689318370799, 31005436248594896441733, 885614872309613750483721526, 63247599647658758935122240950370, 11261549689102506355299411976654023890 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A302150.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302150.

Sequence in context: A126776 A214143 A320986 * A015489 A153061 A277762

Adjacent sequences:  A302142 A302143 A302144 * A302146 A302147 A302148

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 02 2018

STATUS

approved

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Last modified December 3 14:51 EST 2020. Contains 338906 sequences. (Running on oeis4.)