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%I #12 Nov 06 2013 23:20:43
%S 1,5,171,21845,11184811,22906492245,187649984473771,
%T 6148914691236517205,805950546409752783137451,
%U 422550200076076467165567735125,886151997189943915269204706853563051,7433581732843541047178572757549453835326805
%N a(n) = Jacobsthal(n^2), where Jacobsthal(n) = A001045(n), for n>=1.
%F a(n) = (2^(n^2) - (-1)^n) / 3.
%F One-third the logarithmic derivative of A211892.
%o (PARI) {a(n)=(2^(n^2)-(-1)^n)/3}
%o for(n=1,15,print1(a(n),", "))
%Y Cf. A211892, A083228, A231292.
%K nonn
%O 1,2
%A _Paul D. Hanna_, Nov 06 2013
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