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 A081025 #3 Mar 30 2012 18:35:41 %S A081025 1,2,3,5,4,9,8,17,14,31,15,48,21,79,30,127,40,206,41,333,47,539,53, %T A081025 872,63,1411,66,2283,75,3694,76,5977,82,9671,86,15648,92,25319,99, %U A081025 40967,102,66286,108,107253,115,173539,118,280792,121,454331,131,735123,143 %N A081025 Variation on Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) is smallest (n odd) or largest (n even) new number that is the sum of two distinct earlier terms. %D A081025 Suggested by Dan Asimov in post to math-fun, 2/11/2003. %Y A081025 Cf. A002858, A081026. %K A081025 nonn %O A081025 1,2 %A A081025 _David W. Wilson_, Mar 02 2003