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%I #18 Sep 08 2022 08:45:57
%S 1,1,5,15,48,163,565,1985,7085,25575,93206,342392,1266205,4709393,
%T 17602325,66076419,248983611,941362695,3569842947,13574217626,
%U 51741723660,197665011735,756653163200,2901803883615,11147523830125,42891425022576,165269711096165
%N a(n) = floor((1 + 4^n)/(1 + 4*n)).
%H Vincenzo Librandi, <a href="/A191641/b191641.txt">Table of n, a(n) for n = 1..1000</a>
%t f[n_] := Floor[(1+4^n)/(1+4 n)]
%t Table[f[n], {n, 1, 40}] (* A191641 *)
%o (Magma) [Floor((1+4^n)/(1+4*n)): n in [1..30] ]; // _Vincenzo Librandi_, Sep 10 2011
%o (Maxima) A191641(n):=floor((1+4^n)/(1+4*n))$ makelist(A191641(n),n,1,30); /* _Martin Ettl_, Oct 25 2012 */
%Y Cf. A191640, A191634, A191633.
%K nonn
%O 1,3
%A _Clark Kimberling_, Jun 09 2011
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