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 A115650 #2 Mar 30 2012 17:40:35 %S A115650 1,3,6,10,15,21,28,66,105,120,153,171,435,561,946,1378,1485,3916,4005, %T A115650 4278,4851,4950,11781,14365,15576,47586,50086,51360,57970,60378,60726, %U A115650 61425,61776,139128,145530,146070,149878,150426,182710,659526,702705 %N A115650 Triangular numbers which are the sum of distinct double factorials (A006882). %C A115650 Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!. %e A115650 T(527) = 19128 = 13!! + 10!! + 7!! + 6!!. %Y A115650 Cf. A006882, A115648, A115649. %K A115650 nonn %O A115650 1,2 %A A115650 _Giovanni Resta_, Jan 28 2006