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A257419 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 0
512, 7652, 117324, 1770206, 12316842, 115919394, 1037269100, 6191314193, 57799643410, 478127487069, 2903676329504, 27615631745955, 219195987569254, 1325497215293808 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A257426

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Cf. A257426

Sequence in context: A254012 A258518 A222775 * A255749 A251186 A257202

Adjacent sequences:  A257416 A257417 A257418 * A257420 A257421 A257422

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 22 2015

STATUS

approved

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Last modified July 22 14:33 EDT 2019. Contains 325222 sequences. (Running on oeis4.)