OFFSET
0,3
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..404
J.-P. Allouche, The zeta-regularized product of odious numbers, arXiv:1906.10532 [math.NT], 2019.
FORMULA
a(n) = Product_{k=1..n} A000069(k).
MATHEMATICA
Join[{1}, FoldList[Times, Select[Range[0, 50], OddQ[DigitCount[#, 2, 1]]&]]] (* Harvey P. Dale, Aug 09 2024 *)
PROG
(PARI) f(n) = 2*n - 1 - hammingweight(n-1)%2; \\ A000069
a(n) = prod(k=1, n, f(k))
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Jun 26 2019
STATUS
approved