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A186487
Number of (n+1)X(n+1) 0..6 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors
1
2401, 2923, 122034, 464292, 7513081, 24490909, 378414577, 1358113549, 19707528913, 75371432509, 1024871726713, 4153219862605, 53385123138265, 228131841095293, 2786244049366297, 12494376047174653, 145674143950067833
OFFSET
1,1
COMMENTS
Diagonal of A186488
LINKS
EXAMPLE
Some solutions for 3X3
..5..6..0....4..5..0....6..4..0....0..0..4....3..2..0....0..0..0....3..3..0
..3..0..6....0..0..5....1..0..4....0..0..4....0..0..2....1..0..0....1..0..3
..0..3..5....0..0..3....0..1..4....0..0..4....0..0..2....6..1..0....0..1..5
CROSSREFS
Sequence in context: A176767 A018865 A186488 * A043396 A103125 A074384
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 22 2011
STATUS
approved