A234395 Number of (2+2) X (n+2) 0..3 arrays with no increasing sequence of length 3 vertically, diagonally downwards or antidiagonally downwards.

9292808, 1687142836, 312048302829, 57796098504371, 10689939176311218, 1976898869137875008, 365629104612615854980, 67624525811802767580890, 12507319228907396001450322, 2313255231517134891957912331, 427841722589367062975056658844, 79130294349383184839256471190721

Offset

1,1

Links

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

R. H. Hardin, Empirical recurrence of order 85

Formula

Empirical recurrence of order 85 (see link above).

Example

Some solutions for n=1:
..0..0..1....0..0..0....0..0..1....1..0..1....0..0..0....0..0..0....1..0..0
..0..0..3....0..0..2....0..0..2....0..1..0....0..0..3....0..0..3....0..0..2
..1..0..0....3..0..2....0..1..1....1..1..3....3..0..0....3..1..3....3..0..0
..1..2..3....0..1..1....3..0..0....1..1..1....2..0..2....1..1..0....3..2..1

Crossrefs

Row 2 of A234393.

Sequence in context: A105175 A212469 A251280 * A204510 A328207 A069376

Adjacent sequences: A234392 A234393 A234394 * A234396 A234397 A234398

Keyword

nonn

Author

R. H. Hardin, Dec 25 2013

Extensions

Name corrected by Andrew Howroyd, Mar 19 2025

Status

approved