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 A176086 #2 Mar 30 2012 18:40:52 %S A176086 1,5,17,53,161,485,1433,4229,12425,36485,106673,311957,909953,2654501, %T A176086 7728401,22503053,65425505,190239989,552507641,1604779373,4656679889 %N A176086 Partial sums of A001394. %C A176086 Partial sums of number of n-step self-avoiding walks on diamond. The subsequence of primes in this partial sum begins: 5, 17, 53, 1433, 4229, 311957, 2654501, 7728401, 1604779373. %F A176086 a(n) = SUM[i=0..n] A001394(i). %e A176086 a(19) = 1 + 4 + 12 + 36 + 108 + 324 + 948 + 2796 + 8196 + 24060 + 70188 + 205284 + 597996 + 1744548 + 5073900 + 14774652 + 42922452 + 124814484 + 362267652 + 1052271732 = 1604779373 is prime . %Y A176086 Cf. A001394. %K A176086 nonn %O A176086 0,2 %A A176086 _Jonathan Vos Post_, Apr 08 2010