1,2

F. Harary and E. M. Palmer, Enumeration of self-converse digraphs, Mathematika, 13 (1966), 151-157.

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 155, Table 6.6.1 (but the last entry is wrong).

R. W. Robinson, personal communication.

R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1980.

R. W. Robinson, Table of n, a(n) for n = 1..28

Cf. A002500.

Sequence in context: A004102 A072638 A080526 this_sequence A047833 A047834 A136507

Adjacent sequences: A002496 A002497 A002498 this_sequence A002500 A002501 A002502

nonn,nice

njas

More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 17 2000