OFFSET
5,1
LINKS
V. I. Rodionov, On the number of labeled acyclic digraphs, Discr. Math. 105 (1-3) (1992), 319-321.
FORMULA
a(n) = (n-4)*(n-3)*(n-2)*(n-1)*n*(n^9 + 3*n^8 - 26*n^7 - 168*n^6 - 259*n^5 + 1743*n^4 + 15044*n^3 + 40722*n^2 - 111060*n - 817320)/5040. - Vaclav Kotesovec, Apr 11 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2009
EXTENSIONS
More terms from Vaclav Kotesovec, Apr 11 2020
Offset changed to n=5 by Petros Hadjicostas, Apr 11 2020
STATUS
approved