A183614 1/120 the number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock containing four distinct values

1, 56, 7792, 2708848, 2359936032, 5165337368432, 28435992292698928

Offset

1,2

Comments

Diagonal of A183622

Links

Table of n, a(n) for n=1..7.

Example

Some solutions with the first square being 0123 for 3X3
..0..1..4....0..1..4....0..1..0....0..1..0....0..1..0....0..1..4....0..1..2
..2..3..0....2..3..0....2..3..2....2..3..4....2..3..2....2..3..2....2..3..4
..1..4..2....4..1..4....0..4..0....1..0..2....1..0..1....0..1..0....4..1..2

Crossrefs

Sequence in context: A201240 A329104 A233428 * A082167 A006690 A202922

Adjacent sequences: A183611 A183612 A183613 * A183615 A183616 A183617

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved