A233233 Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order

1, 19, 18744, 338046654, 83262848013541, 273407904115337411320, 11963921132630138069523033663, 6976482888479442637729140675454130898

Offset

1,2

Comments

Diagonal of A233239

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..0..1..1....0..1..2....0..1..2....0..0..1....0..1..5....0..1..2....0..1..1
..2..0..1....2..1..1....2..0..2....4..0..4....2..1..0....0..1..1....1..0..0
..3..0..4....1..5..1....1..1..1....4..2..4....0..2..2....2..0..0....0..1..2

Crossrefs

Sequence in context: A198412 A110392 A107100 * A203581 A125043 A249907

Adjacent sequences: A233230 A233231 A233232 * A233234 A233235 A233236

Keyword

nonn

Author

R. H. Hardin, Dec 06 2013

Status

approved