A239026 Number of nX4 0..2 arrays with no element equal to the sum of elements to its left or one plus the sum of elements above it, modulo 3

1, 5, 11, 59, 149, 806, 2195, 11768, 33417, 177087, 514763, 2701462, 7959113, 41470771, 123166255, 638542081, 1905821801, 9846665639, 29480427979, 151961034078, 455874537477, 2346202859972, 7047642531511, 36233420401775

Offset

1,2

Comments

Column 4 of A239030

Links

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

Formula

Empirical: a(n) = 50*a(n-2) -1020*a(n-4) +11131*a(n-6) -71319*a(n-8) +275531*a(n-10) -629492*a(n-12) +789744*a(n-14) -456320*a(n-16) +76800*a(n-18)

Example

Some solutions for n=5
..2..0..0..0....2..0..0..0....2..0..0..0....2..0..0..0....2..0..0..0
..1..0..0..2....2..0..0..0....1..0..2..2....1..0..2..2....2..0..0..0
..2..0..0..1....1..0..0..0....2..0..1..2....2..0..1..2....1..2..2..0
..1..0..0..0....1..2..2..0....2..0..0..1....1..2..2..0....2..1..1..2
..2..0..0..0....2..1..1..0....1..2..2..1....2..1..2..0....1..0..0..2

Crossrefs

Sequence in context: A153812 A269454 A153209 * A106257 A104358 A104359

Adjacent sequences: A239023 A239024 A239025 * A239027 A239028 A239029

Keyword

nonn

Author

R. H. Hardin, Mar 09 2014

Status

approved