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A373280
Expansion of Sum_{k>=0} x^(4^k) / (1 - 4*x^(4^k)).
5
1, 4, 16, 65, 256, 1024, 4096, 16388, 65536, 262144, 1048576, 4194320, 16777216, 67108864, 268435456, 1073741889, 4294967296, 17179869184, 68719476736, 274877907200, 1099511627776, 4398046511104, 17592186044416, 70368744178688, 281474976710656, 1125899906842624
OFFSET
1,2
LINKS
FORMULA
G.f. A(x) satisfies A(x) = x/(1 - 4*x) + A(x^4).
If n == 0 (mod 4), a(n) = 4^n + a(n/4) otherwise a(n) = 4^n.
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, May 30 2024
STATUS
approved