OFFSET
1,2
FORMULA
a(n) ~ c * 2^(n*(n+1)*(2*n+1)/6), where c = A335011 = Product_{k>=1} (1 - 1/2^k)^k.
MATHEMATICA
Table[Product[(2^k - 1)^k, {k, 1, n}], {n, 1, 10}]
PROG
(PARI) a(n) = prod(k=1, n, (2^k-1)^k); \\ Michel Marcus, May 19 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, May 19 2020
STATUS
approved