A001432 Number of graphs with n nodes and n-4 edges. (Formerly M1397 N0544)

0, 0, 0, 1, 1, 2, 5, 11, 25, 66, 172, 485, 1446, 4541, 15036, 52496, 192218, 737248, 2952621, 12313532, 53336122, 239380403, 1110793092, 5318743428, 26233496486, 133074975399

Offset

1,6

References

J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 146.

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

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

Links

Sean A. Irvine, Table of n, a(n) for n = 1..40

M. L. Stein and P. R. Stein, Enumeration of Linear Graphs and Connected Linear Graphs up to p = 18 Points. Report LA-3775, Los Alamos Scientific Laboratory of the University of California, Los Alamos, NM, Oct 1967.

Mathematica

(* first do *) Needs["Combinatorica`"] (* then *) Table[ NumberOfGraphs[n, n-4], {n, 4, 26}] (* Robert G. Wilson v *)

Crossrefs

Cf. A008406.

Sequence in context: A106336 A226974 A047775 * A127075 A053429 A266879

Adjacent sequences: A001429 A001430 A001431 * A001433 A001434 A001435

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

More terms from Vladeta Jovovic, Jan 03 2000

Status

approved