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^13 + n^12 - 61*n^11 - 271*n^10 + 501*n^9 + 10539*n^8 + 69721*n^7 + 170899*n^6 - 1975510*n^5 - 21334612*n^4 - 30150228*n^3 + 619527780*n^2 + 1942605000*n - 10974342960)/362880. - 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