OFFSET
0,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..11
Sylvia Wenmackers, On the Limits of Comparing Subset Sizes within N, J. Phil. Math. (2024) Vol. 1, 223-251. See p. 229.
FORMULA
a(n) = A001146(n) - a(n-1).
EXAMPLE
a(0) = 2^1 = 2.
a(1) = 2^2 - 2^1 = 2.
a(2) = 2^4 - 2^2 + 2^1 = 14.
a(3) = 2^8 - 2^4 + 2^2 - 2^1 = 242.
a(4) = 2^16 - 2^8 + 2^4 - 2^2 + 2^1 = 65294.
MATHEMATICA
a[n_] := (-1)^n * Sum[(-1)^k * 2^(2^k), {k, 0, n}]; Array[a, 9, 0] (* Amiram Eldar, May 07 2021 *)
PROG
(PARI) {a(n) = (-1)^n*sum(k=0, n, (-1)^k*2^2^k)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Sep 08 2019
STATUS
approved