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 A164679 #6 May 17 2016 11:49:37
%S A164679 1,2,1,5,4,2,10,9,7,3,19,18,16,11,4,33,32,30,25,16,5,57
%N A164679 Convolve A001399 with sequences which map to 2,3,5,7,11,13,17... A000040 then, by bending when needed, summarize the results in a triangular array.
%C A164679 Apparently the terms can be constructed by fixing the generating function of the diagonal g_0(x) = 1/(1-x)/(1-x^2)/(1-x^3), A001399, and deriving the generating function of the i-th subdiagonal by g_i(x) = g_{i-1}(x)/(1-x^i), i>=1. - _R. J. Mathar_, May 17 2016
%e A164679 1;
%e A164679 2, 1;
%e A164679 5, 4, 2;
%e A164679 10, 9, 7, 3;
%e A164679 19, 18, 16, 11, 4;
%e A164679 33, 32, 30, 25, 16, 5;
%e A164679 57
%Y A164679 Cf. A000098 (first column), A164678 (a similar triangle). Diagonals are A001399, A000601, A097701, A117485, ...
%K A164679 easy,nonn,tabl,uned
%O A164679 1,2
%A A164679 _Alford Arnold_, Sep 05 2009