OFFSET
1,2
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..60
Eric Weisstein's World of Mathematics, Line Graph.
FORMULA
MATHEMATICA
<< Combinatorica`; With[{e = Table[NumberOfGraphs[2 n, n], {n, 12}]}, e - Join[{0, 0, 1}, Drop[e, -3]]] (* Eric W. Weisstein, Oct 30 2017 *)
<< Combinatorica`; With[{e = Table[Coefficient[GraphPolynomial[2 n, x], x, n], {n, 12}], e - Join[{0, 0, 1}, Drop[e, -3]]] (* Eric W. Weisstein, Oct 30 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Aug 14 2007
EXTENSIONS
a(25)-a(60) from Max Alekseyev, Sep 07 2016
STATUS
approved