A240512 - OEIS

A240512

Number of n X n 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order.

1, 3, 10, 99, 1376, 37624, 1906245, 180760099, 31517059634, 10196460883584

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OFFSET

1,2

COMMENTS

Diagonal of A240519.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A240519.

Sequence in context: A005205 A216450 A181079 * A065924 A013233 A013226

Adjacent sequences: A240509 A240510 A240511 * A240513 A240514 A240515

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 06 2014

STATUS

approved