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 A306733 #5 Mar 06 2019 20:18:01
%S A306733 1,1,1,1,1,2,3,2,3,5,5,8,11,11,17,19,22,33,38,50,69,82,103,133,165,
%T A306733 201,249,319,389,492,621,765,974,1206,1500,1857,2302,2843,3494,4311,
%U A306733 5275,6533,8027,9840,12138,14903,18340,22541,27619,33811,41429,50682,61809,75422,91807
%N A306733 Expansion of Sum_{k>=0} x^(k*(k+1)/2) * Product_{j=1..k} (1 + x^j)^j.
%t A306733 nmax = 54; CoefficientList[Series[Sum[x^(k (k + 1)/2) Product[(1 + x^j)^j, {j, 1, k}], {k, 0, nmax}], {x, 0, nmax}], x]
%Y A306733 Cf. A053261, A206138, A306706.
%K A306733 nonn
%O A306733 0,6
%A A306733 _Ilya Gutkovskiy_, Mar 06 2019