A305034 - OEIS

A305034

Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 7, 19, 43, 362, 7757, 135992, 3230419, 255165854, 28197703038, 3615941320107, 967198491853067, 490753581379395346, 345929768396106517270

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OFFSET

1,2

COMMENTS

Diagonal of A305040.

LINKS

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 24 2018

STATUS

approved