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 A098713 #10 Sep 08 2022 08:45:15 %S A098713 1,23,159,895,4607,22527,106495,491519,2228223,9961471,44040191, %T A098713 192937983,838860799,3623878655,15569256447,66571993087,283467841535, %U A098713 1202590842879,5085241278463,21440476741631,90159953477631,378231999954943,1583296743997439,6614661952700415,27584547717644287,114841790497947647 %N A098713 a(n) = (2n+1)*2^(2n+1) - 1. %p A098713 A098713 := proc(n) (2*n+1)*2^(2*n+1)-1 ; end proc: # _R. J. Mathar_, Feb 04 2011 %o A098713 (Magma) [ (2*n+1)*2^(2*n+1) - 1: n in [0..30] ]; // _Vincenzo Librandi_, Feb 04 2011 %Y A098713 Cf. A003261. %K A098713 nonn %O A098713 0,2 %A A098713 _Parthasarathy Nambi_, Sep 28 2004 %E A098713 More terms from _Sam Alexander_, Jan 06 2005