1,2

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

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

R. C. Read, personal communication.

Read, R. C.; Wright, E. M.; Colored graphs: A correction and extension. Canad. J. Math. 22 1970 594-596.

Essentially the same as A002031.

Sequence in context: A117394 A003308 A032185 this_sequence A032117 A137244 A156529

Adjacent sequences: A002024 A002025 A002026 this_sequence A002028 A002029 A002030

nonn

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