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^11 + 2*n^10 - 43*n^9 - 226*n^8 - 21*n^7 + 5110*n^6 + 36247*n^5 + 91954*n^4 - 612172*n^3 - 5449152*n^2 - 2743020*n + 82544280)/40320. - 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