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A297987 Number of nXn 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero. 0
0, 4, 48, 466, 5100, 74675, 1276012, 30240388, 1056360518, 50037661325, 3406737828874, 353272517327686, 52791942245108114 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A297993.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A297993.

Sequence in context: A111903 A059409 A297816 * A298842 A298649 A299603

Adjacent sequences:  A297984 A297985 A297986 * A297988 A297989 A297990

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2018

STATUS

approved

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Last modified April 25 18:12 EDT 2019. Contains 322461 sequences. (Running on oeis4.)