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A157051 Number of connected unlabeled non-bipartite graphs on n nodes. 3
0, 0, 0, 1, 3, 16, 95, 809, 10935, 260350, 11712539, 1006674967, 164059617696, 50335905627489, 29003487431654737, 31397381142185989848, 63969560113210957966315, 245871831682083553779103249, 1787331725248899067681312999794, 24636021429399867654036551645873645, 645465483198722799426625560872826564232 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
COMMENTS
Inverse Euler transform of A157016.
LINKS
FORMULA
a(n) = A001349(n) - A005142(n).
MATHEMATICA
A001349 = Cases[Import["https://oeis.org/A001349/b001349.txt", "Table"], {_, _}][[All, 2]];
A005142 = Cases[Import["https://oeis.org/A005142/b005142.txt", "Table"], {_, _}][[All, 2]];
a[n_] := A001349[[n + 1]] - A005142[[n + 1]];
a /@ Range[0, 50] (* Jean-François Alcover, Sep 21 2019 *)
CROSSREFS
Sequence in context: A181067 A006347 A000270 * A000271 A157016 A228792
KEYWORD
nonn
AUTHOR
Max Alekseyev, Feb 22 2009
EXTENSIONS
a(0) corrected, a(18)-a(20) added by Max Alekseyev, Jun 24 2013
STATUS
approved

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Last modified March 19 02:49 EDT 2024. Contains 370952 sequences. (Running on oeis4.)