OFFSET
1,4
LINKS
J. W. Moon, The second moment of the complexity of a graph, Mathematika 11:2 (1964), 95-98.
FORMULA
a(n) = Sum_{m=0..n-1} (-1)^m * n^(2*(n-m-2)) * (n-1)!/(n-1-m)! * Sum_{t=0..m} binomial(n-t,m-t) * n^t/t!.
PROG
(PARI) { A291952(n) = sum(m=0, n-1, (-1)^m * n^(2*(n-m-2)) * (n-1)!/(n-1-m)! * sum(t=0, m, binomial(n-t, m-t) * n^t/t!) ); }
CROSSREFS
KEYWORD
nonn
AUTHOR
Max Alekseyev, Sep 06 2017
STATUS
approved