0,2

T. Y. Chow, H. Eriksson and C. K. Fan, Chess tableaux, Elect. J. Combin., 11 (2) (2005), #A3.

Sequence in context: A001137 A123593 A122748 this_sequence A063402 A139800 A007971

Adjacent sequences: A108771 A108772 A108773 this_sequence A108775 A108776 A108777

nonn

N. J. A. Sloane (njas(AT)research.att.com), Jun 27 2005