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 A209983 #5 Mar 30 2012 18:58:16 %S A209983 0,10,26,58,90,154,186,282,346,442,506,666,730,922,1018,1146,1274, %T A209983 1530,1626,1914,2042,2234,2394,2746,2874,3194,3386,3674,3866,4314, %U A209983 4442,4922,5178,5498,5754,6138,6330,6906,7194,7578,7834 %N A209983 (A209982)/2. %C A209983 See A210000 for a guide to related sequences. %t A209983 (See the Mathematica section at A209981.) %Y A209983 Cf. A210000. %K A209983 nonn %O A209983 0,2 %A A209983 _Clark Kimberling_, Mar 17 2012