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 A086274 #5 Mar 30 2012 18:57:05
%S A086274 1,4,12,29,60,111,189,302,459,670,946,1299,1742,2289,2955,3756,4709,
%T A086274 5832,7144,8665,10416,12419,14697,17274,20175,23426,27054,31087,35554,
%U A086274 40485,45911,51864,58377,65484,73220,81621,90724,100567,111189
%N A086274 Antidiagonal sums of A086272 (and of A086273).
%F A086274 a(n)=n+Sum{(k+1)C(n+1-k, 2): k=1, 2, ..., n}.
%F A086274 n(n^3+6n^2-n+18)/24.
%Y A086274 Cf. A086272, A086273.
%Y A086274 A005582(n-1) + n.
%K A086274 nonn
%O A086274 1,2
%A A086274 _Clark Kimberling_, Jul 14 2003