A014397 Number of loopless multigraphs with 7 nodes and n edges.

1, 1, 3, 8, 22, 60, 173, 471, 1303, 3510, 9234, 23574, 58464, 140340, 326792, 738090, 1619321, 3455129, 7180856, 14555856, 28819926, 55808840, 105834657, 196779279, 359124362, 643976482, 1135731758, 1971734302, 3372477533

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

References

• CRC Handbook of Combinatorial Designs, 1996, p. 650.
• F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 88, (4.1.18).

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..1000

Crossrefs

Row 7 of A192517.

Cf. A001399, A003082, A014395, A014396, A014398.

Programs

PARI

concat([1], G(7, 30)) \\ See A191646 for G. - Andrew Howroyd, Mar 15 2020

Extensions

More terms and better description from Vladeta Jovovic, Dec 29 1999