%I #17 Sep 08 2022 08:45:56
%S 4,35,313,2813,25309,227765,2049853,18448613,166037389,1494336245,
%T 13449025693,121041230213,1089371069869,9804339624725,88239056614333,
%U 794151509512613,7147363585580749,64326272270161205,578936450431319773,5210428053881615813,46893852484934018029
%N a(n) = A188526(n) / 7.
%H Vincenzo Librandi, <a href="/A188527/b188527.txt">Table of n, a(n) for n = 0..500</a>
%F a(n) = (3^(2*n + 3) + 2^n) / 7.
%o (Magma) [(3^(2*n + 3) + 2^n)/7: n in [0..20]]; // _Vincenzo Librandi_, Jul 17 2011
%K nonn,easy
%O 0,1
%A _Reinhard Zumkeller_, Apr 03 2011