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A302546
a(n) = Sum_{k = 1...n} 2^binomial(n, k).
0
0, 2, 6, 18, 98, 2114, 1114242, 68723671298, 1180735735906024030722, 170141183460507917357914971986913657858, 7237005577335553223087828975127304179197147198604070555943173844710572689410
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