OFFSET
0,2
FORMULA
a(n) = 1 + n + Sum_{k=2..n+1} (k^(n-k+1)-1)/(k-1).
a(n) = 1 + A103439(n). - Mathew Englander, Dec 19 2020
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 28 2005
STATUS
approved