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 A253765 #8 Jan 27 2015 01:16:19 %S A253765 1,3,9,15,5,25,35,7,21,27,39,13,26,28,32,18,24,34,36,30,38,19,95,57, %T A253765 69,23,115,75,81,87,29,58,64,68,54,60,66,72,74,37,111,117,123,41,82, %U A253765 88,92,78,84,94,47,329,203,147,141,153,171,102,108,112,116,114,118,59,177,159,120,124,128,130,136,126,132,134,138,142,71,213,207,144 %N A253765 Bisection of A098550. %F A253765 a(n) = A098550(2n-1). %Y A253765 Cf. A098550, A253766. %K A253765 nonn %O A253765 1,2 %A A253765 _Omar E. Pol_, Jan 20 2015