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 A298435 #7 Apr 08 2018 06:52:57
%S A298435 1,2,3,6,9,12,20,28,36,52,70,88,120,156,192,250,318,386,488,606,727,
%T A298435 900,1101,1308,1590,1916,2257,2706,3225,3768,4465,5270,6117,7178,8399,
%U A298435 9686,11274,13094,15020,17352,20017,22846,26230,30080,34175,39010,44500,50346,57184,64914,73156
%N A298435 Expansion of Product_{k>=1} 1/(1 - x^(k*(k+1)/2))^2.
%C A298435 Number of partitions of n into triangular numbers of 2 kinds.
%C A298435 Self-convolution of A007294.
%H A298435 Vaclav Kotesovec, <a href="/A298435/b298435.txt">Table of n, a(n) for n = 0..10000</a>
%H A298435 <a href="/index/Par#part">Index entries for related partition-counting sequences</a>
%F A298435 G.f.: Product_{k>=1} 1/(1 - x^(k*(k+1)/2))^2.
%F A298435 a(n) ~ exp(3*(Pi/2)^(1/3) * Zeta(3/2)^(2/3) * n^(1/3)) * Zeta(3/2)^(5/3) / (2^(29/6) * sqrt(3) * Pi^(5/3) * n^(13/6)). - _Vaclav Kotesovec_, Apr 08 2018
%e A298435 a(3) = 6 because we have [3a], [3b], [1a, 1a, 1a], [1a, 1a, 1b], [1a, 1b, 1b] and [1b, 1b, 1b].
%t A298435 nmax = 50; CoefficientList[Series[Product[1/(1 - x^(k (k + 1)/2))^2, {k, 1, nmax}], {x, 0, nmax}], x]
%Y A298435 Cf. A000217, A000712, A007294, A279225.
%K A298435 nonn
%O A298435 0,2
%A A298435 _Ilya Gutkovskiy_, Jan 19 2018