A260022 - OEIS

%I #13 Jun 20 2022 13:16:30

%S 1,3,7,13,29,55,115,209,465,883,1847,3357,7437,14087,29443,53505,

%T 119041,226051,472839,859405,1903901,3606327,7537523,13697489,

%U 30474449,57868403,121045047,220004381,487391245,923205639,1929576451,3506503681,7801470977,14814478339,30987976711,56321966093

%N A bisection of A006921.

%H Reinhard Zumkeller, <a href="/A260022/b260022.txt">Table of n, a(n) for n = 0..1000</a>

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

%o (Haskell)

%o a260022 = a006921 . (* 2)  -- _Reinhard Zumkeller_, Jul 14 2015

%o (Python)

%o 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

%Y Cf. A006921, A168081.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Jul 14 2015