7,3

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

CRC Handbook of Combinatorial Designs, 1996, p. 647.

Gordon Royle, personal communication.

Sequence in context: A093448 A094653 A135250 this_sequence A014374 A125709 A043068

Adjacent sequences: A006923 A006924 A006925 this_sequence A006927 A006928 A006929

nonn

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