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

2540, 7212, 23295, 81959, 261188, 806538, 2368198, 6624259, 17894542, 46475759, 117362361, 289972349, 700430787, 1660287016, 3874041941, 8916784297, 20277482009, 45635984351, 101763767073, 225107832296, 494489541033

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