OFFSET
1,1
COMMENTS
Subdiagonal 3 of A206455.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = Sum_{i=0..floor((n+3)/(n+1))} ((-1)^i*(n+1)^((n+3) -(n+1)*i)*binomial((n+3)-n*i,i)).
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 07 2012
STATUS
approved