OFFSET
1,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..1000
W. C. Yang, Derivatives are essentially integer partitions, Discrete Mathematics, 222(1-3), July 2000, 235-245.
FORMULA
G.f.: (5*x^6-28*x^5+53*x^4-27*x^3-24*x^2+21*x+1)*x/(1-x)^9.
a(n) = n*(n+1)*(n^6+75*n^5+1703*n^4+13697*n^3+29472*n^2-30788*n+6000)/40320.
MAPLE
a:= n-> n*(n+1)*(6000+(-30788+(29472+(13697+(1703+(75+n)*n)*n)*n)*n)*n)/40320:
seq(a(n), n=1..40);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 18 2012
STATUS
approved