A260022 A bisection of A006921.

1, 3, 7, 13, 29, 55, 115, 209, 465, 883, 1847, 3357, 7437, 14087, 29443, 53505, 119041, 226051, 472839, 859405, 1903901, 3606327, 7537523, 13697489, 30474449, 57868403, 121045047, 220004381, 487391245, 923205639, 1929576451, 3506503681, 7801470977, 14814478339, 30987976711, 56321966093

Offset

0,2

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..1000

Formula

a(n) = A006921(2*n).

Prog

(Haskell)
a260022 = a006921 . (* 2)  -- Reinhard Zumkeller, Jul 14 2015
(Python)
def A260022(n): return sum(int(not r & ~(2*n-r))*2**(n-r) for r in range(n+1)) # Chai Wah Wu, Jun 20 2022

Crossrefs

Cf. A006921, A168081.

Sequence in context: A284401 A284542 A283323 * A134270 A091565 A025249

Adjacent sequences: A260019 A260020 A260021 * A260023 A260024 A260025

Keyword

nonn

Author

N. J. A. Sloane, Jul 14 2015

Status

approved