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A281463 Number of nXn 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards. 0
1, 8, 24, 96, 278, 706, 1887, 4795, 11794, 28951, 70400, 167177, 395417, 926397, 2160731, 4999028 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A281469.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281469.

Sequence in context: A217016 A019260 A019221 * A267326 A063515 A220706

Adjacent sequences:  A281460 A281461 A281462 * A281464 A281465 A281466

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 22 2017

STATUS

approved

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Last modified February 16 15:17 EST 2020. Contains 331961 sequences. (Running on oeis4.)