2,2

J. E. Goodman and J. O'Rourke, editors, Handbook of Discrete and Computational Geometry, CRC Press, 1997, p. 935.

Sequence in context: A003978 A122645 A122646 this_sequence A063428 A133439 A072300

Adjacent sequences: A028493 A028494 A028495 this_sequence A028497 A028498 A028499

nonn

N. J. A. Sloane (njas(AT)research.att.com).