A253980 Number of (n+2) X (3+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal maximum nondecreasing horizontally and vertically.

21304, 417518, 8727838, 179261149, 3672381306, 75620185999, 1556452499274, 32027982651882, 659238041669648, 13568633472966170, 279271703727266760, 5748131163323313403, 118311298400157452800, 2435148116665821992581, 50121612988444608830732, 1031631646808306609891520

Offset

1,1

Links

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

R. H. Hardin, Empirical recurrence of order 68.

Formula

Empirical recurrence of order 68 (see link above).

Example

Some solutions for n=1:
..1..1..0..0..0....0..0..1..1..0....0..0..1..1..1....0..0..0..0..1
..1..0..1..1..1....0..1..0..1..1....0..0..1..1..0....0..1..1..1..1
..1..1..1..0..0....1..0..1..1..1....1..0..1..1..1....0..1..1..1..1

Crossrefs

Column 3 of A253985.

Sequence in context: A177857 A254385 A254392 * A349508 A250532 A234454

Adjacent sequences: A253977 A253978 A253979 * A253981 A253982 A253983

Keyword

nonn

Author

R. H. Hardin, Jan 21 2015

Status

approved