OFFSET
0,2
FORMULA
a(n) = A001315(n) - 2.
MATHEMATICA
Table[Sum[2^Binomial[n, d], {d, n}], {n, 10}]
PROG
(PARI) a(n) = sum(k=1, n, 2^binomial(n, k)); \\ Michel Marcus, Jun 21 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Jun 20 2018
STATUS
approved