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).

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

R. C. Read, personal communication.

Sequence in context: A077817 A032324 A032072 this_sequence A156148 A156824 A053002

Adjacent sequences: A002027 A002028 A002029 this_sequence A002031 A002032 A002033

nonn

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