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A007149 2-part of number of graphs on n nodes.
(Formerly M0017)
3
0, 0, 1, 2, 0, 1, 2, 2, 1, 2, 4, 3, 4, 4, 5, 5, 4, 5, 8, 6, 8, 7, 8, 8, 9, 9, 10, 10, 15, 11, 12, 12, 11, 12, 16, 13, 16, 14, 15, 15, 17, 16, 17, 17, 19, 18, 19, 19, 20, 20, 21, 21, 23, 22, 23, 23 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

Steven C. Cater and Robert W. Robinson, "Exponents of 2 in the numbers of unlabeled graphs and tournaments," Congressus Numerantium, 82 (1991), pp. 139-155.

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

LINKS

Table of n, a(n) for n=0..55.

Steven C. Cater and Robert W. Robinson, Exponents of 2 in the numbers of unlabeled graphs and tournaments, Preprint. (Annotated scanned copy)

CROSSREFS

Power of 2 dividing A000088.

Sequence in context: A065051 A084665 A035392 * A028832 A260411 A199331

Adjacent sequences:  A007146 A007147 A007148 * A007150 A007151 A007152

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 18 05:17 EDT 2018. Contains 316304 sequences. (Running on oeis4.)