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 A038793 #9 Aug 12 2013 04:59:23 %S A038793 1,4,8,13,21,33,50,73,103,141,188,245,313,393,486,593,715,853,1008, %T A038793 1181,1373,1585,1818,2073,2351,2653,2980,3333,3713,4121,4558,5025, %U A038793 5523,6053,6616,7213,7845,8513,9218,9961,10743,11565,12428 %N A038793 T(n,n-3), array T as in A038792. %F A038793 For n > 4, a(n) = (n^3-9*n^2+38*n-42)/6. %F A038793 a(n) = sum(A007318(n-k, k), k=0..3), n > 4. - _Johannes W. Meijer_, Aug 11 2013 %K A038793 nonn %O A038793 3,2 %A A038793 _Clark Kimberling_, May 02 2000