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%I #16 Aug 08 2020 01:45:19
%S 1,1,3,5,12,25,54,113,235,481,980,1985,4007,8065,16204,32513,65175,
%T 130561,261421,523265,1047129,2095105,4191409,8384513,16771425,
%U 33546241,67097280,134201345,268412287,536838145,1073695485,2147418113
%N a(n) = ceiling((2^n + 1 - 2*floor(2^(n/2)))/2).
%o (PARI) a(n) = ceil((2^n + 1 - 2*floor(2^(n/2)))/2); \\ _Michel Marcus_, Aug 07 2020
%K nonn,easy,less
%O 1,3
%A _Roger L. Bagula_, May 15 2007
%E Edited by _Michel Marcus_ and _Joerg Arndt_, Aug 07 2020
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