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 A115649 #2 Mar 30 2012 17:40:35 %S A115649 1,2,3,4,5,7,8,11,13,20,21,31,38,62,63,65,66,70,72,102,107,109,120, %T A115649 125,217,218,238,240,373,382,387,427,439,834,840,890,915,1440,1474, %U A115649 1638,1650,3213,3220,3241,3332,3540,5886,6751,6855,13730,14078,14911 %N A115649 Numbers whose square is the sum of distinct double factorials (A006882). %C A115649 Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!. %e A115649 102^2 = 1!! + 4!! + 11!!. %Y A115649 Cf. A006882, A115648, A115650. %K A115649 nonn %O A115649 1,2 %A A115649 _Giovanni Resta_, Jan 28 2006