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URL: https://oeis.org/A383471

⇱ A383471 - OEIS

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A383471
a(n) = round(Product_{k=1..n} (1 + 1/2^2^(-k))).
0
1, 2, 3, 6, 12, 23, 46, 93, 185, 370, 739, 1478, 2955, 5910, 11819, 23637, 47274, 94549, 189097, 378194, 756388, 1512776, 3025551, 6051102, 12102203, 24204407, 48408813, 96817626, 193635251, 387270501, 774541003, 1549082005, 3098164010, 6196328019, 12392656038, 24785312075
OFFSET
0,2
MATHEMATICA
Floor[Product[(1+2^(-2^(-k))), {k, 1, n}]+1/2]
PROG
(PARI) a(n) = round(prod(k=1, n, 1 + 1/2^2^(-k))); \\ Michel Marcus, Apr 28 2025
CROSSREFS
Sequence in context: A293363 A326021 A164363 * A306809 A103341 A023675
KEYWORD
nonn
AUTHOR
Greg Huber, Apr 27 2025
STATUS
approved