A233499 Number of (2+2) X (n+2) 0..2 arrays with no increasing sequence of length 3 horizontally or antidiagonally downwards.

424009, 26851581, 1709348346, 108934667695, 6940835448966, 442240878862773, 28176593184596215, 1795219762788597690, 114378735336956365968, 7287404963779880864407, 464301857642373045877140

Offset

1,1

Comments

Row 2 of A233497.

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
..0..0..0....0..2..0....0..0..1....0..0..1....0..0..1....0..1..0....0..1..1
..2..1..0....1..2..1....0..0..1....1..2..1....1..0..1....2..1..0....2..2..1
..1..1..1....1..1..1....0..0..1....1..2..0....0..0..2....1..0..0....0..0..1
..0..0..2....2..0..2....0..1..1....2..0..1....0..2..2....1..0..2....1..0..2

Crossrefs

Cf. A233497.

Sequence in context: A253965 A253761 A204412 * A282337 A192228 A234737

Adjacent sequences: A233496 A233497 A233498 * A233500 A233501 A233502

Keyword

nonn

Author

R. H. Hardin, Dec 11 2013

Status

approved