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%I #17 Sep 08 2022 08:45:57
%S 1,2,6,19,64,215,744,2621,9362,33825,123361,453438,1677721,6242685,
%T 23342213,87652393,330382099,1249445031,4739274257,18024780783,
%U 68719476736,262569940961,1005267773966,3855821598776,14814472458455,57007590219879,219687786700999
%N a(n) = floor((1 + 4^n)/(1 + 3*n)).
%H Vincenzo Librandi, <a href="/A191639/b191639.txt">Table of n, a(n) for n = 1..1000</a>
%t f[n_] := Floor[(1+4^n)/(1+3 n)]
%t Table[f[n], {n, 1, 40}] (* A191639 *)
%o (Magma) [Floor((1+4^n)/(1+3*n)): n in [1..30] ]; // _Vincenzo Librandi_, Sep 10 2011
%o (Maxima) A191639(n):=floor((1+4^n)/(1+3*n))$ makelist(A191639(n),n,1,30); /* _Martin Ettl_, Oct 25 2012 */
%Y Cf. A191638.
%K nonn
%O 1,2
%A _Clark Kimberling_, Jun 09 2011
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