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
Keywords
Links
- Reinhard Zumkeller, Table of n, a(n) for n = 0..1000
Programs
-
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
Formula
a(n) = A006921(2*n).