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A297816 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero. 0
0, 4, 48, 466, 4444, 46701, 467104, 4833331, 52153064, 578390147, 6590059758, 79294094586, 1014580074422, 13933640462306, 204079081718026 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A297823.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A297823.

Sequence in context: A228701 A111903 A059409 * A297987 A298842 A298649

Adjacent sequences:  A297813 A297814 A297815 * A297817 A297818 A297819

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2018

STATUS

approved

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Last modified May 18 06:28 EDT 2022. Contains 353783 sequences. (Running on oeis4.)