A234061 Number of (n+2)X(1+2) 0..3 arrays with no increasing sequence of length 3 horizontally or diagonally downwards

205808, 11758836, 671548560, 38351813588, 2190245258368, 125083358211012, 7143421916769712, 407955761112088052, 23298064277080047968, 1330535932548632543396, 75985963758367046917776

Offset

1,1

Comments

Column 1 of A234068

Links

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

Formula

Empirical: a(n) = 60*a(n-1) -139*a(n-2) -1552*a(n-3) +3544*a(n-4) +640*a(n-5) -4720*a(n-6) +2048*a(n-7)

Example

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

Crossrefs

Sequence in context: A236033 A234068 A234069 * A234060 A115946 A082176

Adjacent sequences: A234058 A234059 A234060 * A234062 A234063 A234064

Keyword

nonn

Author

R. H. Hardin, Dec 19 2013

Status

approved