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A254021 Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
2540, 7212, 23295, 81959, 261188, 806538, 2368198, 6624259, 17894542, 46475759, 117362361, 289972349, 700430787, 1660287016, 3874041941, 8916784297, 20277482009, 45635984351, 101763767073, 225107832296, 494489541033 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A254020

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A172142 A206596 A334932 * A254014 A254888 A248997

Adjacent sequences:  A254018 A254019 A254020 * A254022 A254023 A254024

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 22 2015

STATUS

approved

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Last modified November 28 23:48 EST 2021. Contains 349415 sequences. (Running on oeis4.)