This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A231279 #12 Nov 06 2013 23:20:43
%S A231279 1,5,171,21845,11184811,22906492245,187649984473771,
%T A231279 6148914691236517205,805950546409752783137451,
%U A231279 422550200076076467165567735125,886151997189943915269204706853563051,7433581732843541047178572757549453835326805
%N A231279 a(n) = Jacobsthal(n^2), where Jacobsthal(n) = A001045(n), for n>=1.
%F A231279 a(n) = (2^(n^2) - (-1)^n) / 3.
%F A231279 One-third the logarithmic derivative of A211892.
%o A231279 (PARI) {a(n)=(2^(n^2)-(-1)^n)/3}
%o A231279 for(n=1,15,print1(a(n),", "))
%Y A231279 Cf. A211892, A083228, A231292.
%K A231279 nonn
%O A231279 1,2
%A A231279 _Paul D. Hanna_, Nov 06 2013