Number of partitionings of n X n checkerboard into three edgewise-connected sets.

A068417

Number of partitionings of n X n checkerboard into three edgewise-connected sets.

Terms

    a(0) =0a(1) =4a(2) =258a(3) =10830a(4) =709351a(5) =99699033a(6) =34719687359

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