OFFSET
0,1
FORMULA
From Alois P. Heinz, Mar 19 2020: (Start)
E.g.f.: (x-LambertW(-x))/((1+LambertW(-x))*x). (End)
PROG
(PARI) a(n) = n^n + (n+1)^n; \\ Jinyuan Wang, Mar 19 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Sep 08 2004
EXTENSIONS
a(0)=2 prepended by Alois P. Heinz, Mar 19 2020
STATUS
approved