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A254887 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal median nondecreasing horizontally and vertically 0
512, 8944, 171400, 4577708, 42268052, 290329276, 1890553676, 6706657300, 27187563600, 107210607174, 372692369806, 1336057750714 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A254894

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A070057 A017619 A253928 * A256896 A254234 A254546

Adjacent sequences: A254884 A254885 A254886 * A254888 A254889 A254890

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 10 2015

STATUS

approved

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Last modified November 29 01:35 EST 2022. Contains 358421 sequences. (Running on oeis4.)