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A298649 Number of nXn 0..1 arrays with every element equal to 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero. 0
0, 4, 48, 466, 5124, 75562, 1277500, 30337435, 1060912744, 50167771709, 3415576723102, 354153850821427 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298653.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=5

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

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

..1..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1

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

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

CROSSREFS

Cf. A298653.

Sequence in context: A297816 A297987 A298842 * A299603 A026942 A264727

Adjacent sequences:  A298646 A298647 A298648 * A298650 A298651 A298652

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 24 2018

STATUS

approved

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Last modified July 17 16:58 EDT 2019. Contains 325107 sequences. (Running on oeis4.)