A259882 Number of graphs with n edges having a proper labeling that is bilaterally symmetric and satisfies condition (4.1) of Sheppard (1976).

0, 2, 2, 6, 4, 22, 14, 102, 62

Offset

1,2

Links

Table of n, a(n) for n=1..9.

David A. Sheppard, The factorial representation of major balanced labelled graphs, Discrete Math., 15(1976), no. 4, 379-388. See Table 1.

Crossrefs

Cf. A005193, A005194.

Sequence in context: A062885 A062293 A317368 * A356187 A204991 A054516

Adjacent sequences: A259879 A259880 A259881 * A259883 A259884 A259885

Keyword

nonn,more

Author

N. J. A. Sloane, Jul 10 2015

Status

approved