A068417 Number of partitionings of n X n checkerboard into three edgewise-connected sets.

0, 4, 258, 10830, 709351, 99699033, 34719687359, 32128580602967, 82102610820820733, 593301237469990370097

Offset

1,2

Links

Table of n, a(n) for n=1..10.

J. Kawahara, T. Horiyama, K. Hotta and S. Minato, Generating All Patterns of Graph Partitions within a Disparity Bound, WALCOM 2017. LNCS, vol. 10167, pp. 119-131, Springer, Heidelberg (2017).

Crossrefs

Sequence in context: A114561 A252586 A214136 * A116967 A003382 A112982

Adjacent sequences: A068414 A068415 A068416 * A068418 A068419 A068420

Keyword

nonn

Author

R. H. Hardin, Mar 02 2002

Extensions

a(6)-a(10) from Jun Kawahara, Apr 03 2017

Status

approved