# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/

Search: id:a191630
Showing 1-1 of 1

%I A191630 #19 Sep 08 2022 08:45:57
%S A191630 0,0,1,1,2,4,8,15,26,48,89,163,303,564,1057,1985,3744,7084,13443,
%T A191630 25575,48770,93206,178481,342392,657930,1266204,2440322,4709393,
%U A191630 9099506,17602324,34087042,66076419,128207978,248983611,483939977,941362695,1832519379
%N A191630 a(n) = floor((-1 + 2^n)/(1 + 2*n)).
%H A191630 Vincenzo Librandi, <a href="/A191630/b191630.txt">Table of n, a(n) for n = 1..1000</a>
%t A191630 f[n_] := Floor[(-1 + 2^n)/(2 n + 1)]
%t A191630 Table[f[n], {n, 1, 40}]    (* A191630 *)
%o A191630 (Magma) [Floor((-1 + 2^n)/(2*n + 1)): n in [1..50]]; // _Vincenzo Librandi_, Sep 12 2011
%o A191630 (Maxima) A191630(n):=floor((-1+2^n)/(1+2*n))$ makelist(A191630(n),n,1,30); /* _Martin Ettl_, Oct 25 2012 */
%o A191630 (PARI) a(n) = (2^n-1)\(2*n+1); \\ _Altug Alkan_, Sep 08 2018
%Y A191630 Cf. A191633.
%K A191630 nonn
%O A191630 1,5
%A A191630 _Clark Kimberling_, Jun 09 2011

# Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE