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A257353 Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum or central row sum less than the central column sum 1
220, 2116, 17056, 101124, 482560, 2433600, 12278736, 62948356, 314007680, 1594085476, 8000673008, 40717589796, 204018474192, 1037122265664, 5200337912080, 26444894851600, 132569860224000, 674054417903364 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A257361

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A257361

Sequence in context: A180219 A233626 A251322 * A211820 A215491 A258537

Adjacent sequences:  A257350 A257351 A257352 * A257354 A257355 A257356

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2015

STATUS

approved

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Last modified January 21 16:03 EST 2022. Contains 350479 sequences. (Running on oeis4.)