A186487 - OEIS

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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

2401, 2923, 122034, 464292, 7513081, 24490909, 378414577, 1358113549, 19707528913, 75371432509, 1024871726713, 4153219862605, 53385123138265, 228131841095293, 2786244049366297, 12494376047174653, 145674143950067833

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A186488

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

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