A234375 Number of (n+2) X (2+2) 0..2 arrays with no increasing sequence of length 3 vertically, diagonally downwards or antidiagonally downwards.

406416, 24485940, 1443868938, 84764693441, 4966249171199, 290807719744802, 17025314469552162, 996684368791537441, 58345976442195013994, 3415554697297597829788, 199945020738674492679622, 11704682124293147682604124, 685186107002723545821150231, 40110441193790284709812568348

Offset

1,1

Links

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

R. H. Hardin, Empirical recurrence of order 55

Formula

Empirical recurrence of order 55 (see link above).

Example

Some solutions for n=1:
..0..0..1..2....0..0..0..1....0..0..1..1....0..1..2..1....0..1..2..2
..2..2..2..2....1..0..0..0....0..2..2..1....0..0..1..1....0..0..0..1
..2..1..0..0....1..1..1..0....2..1..2..1....0..2..2..1....2..0..0..2

Crossrefs

Column 2 of A234380.

Sequence in context: A204764 A252626 A237510 * A237919 A363160 A210265

Adjacent sequences: A234372 A234373 A234374 * A234376 A234377 A234378

Keyword

nonn

Author

R. H. Hardin, Dec 25 2013

Extensions

Name corrected by Andrew Howroyd, Mar 20 2025

Status

approved