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 A319247 #5 Sep 16 2018 21:36:25
%S A319247 1,2,3,2,1,4,3,1,5,6,4,1,3,2,7,8,4,2,5,1,9,6,1,10,3,2,1,11,5,2,7,1,4,
%T A319247 3,12,8,1,6,2,13,4,2,1,14,9,1,15,7,2,16,5,3,8,2,10,1,17,18,11,1,6,3,5,
%U A319247 2,1,19,9,2,4,3,1,20,21,12,1,5,4,6,2,1,22
%N A319247 Irregular triangle whose n-th row lists the strict integer partition whose Heinz number is the n-th squarefree number.
%F A319247 T(n,k) = A000720(A265668(n,-k)).
%e A319247 The sequence of strict partitions begins: (), (1), (2), (3), (2,1), (4), (3,1), (5), (6), (4,1), (3,2), (7), (8), (4,2), (5,1), (9), (6,1), (10), (3,2,1), (11), (5,2), (7,1), (4,3), (12), (8,1), (6,2), (13), (4,2,1).
%t A319247 Table[If[n==1,{},Join@@Cases[FactorInteger[n]//Reverse,{p_,k_}:>Table[PrimePi[p],{k}]]],{n,Select[Range[100],SquareFreeQ]}]
%Y A319247 Row lengths are A072047. Rows sums are A319246.
%Y A319247 Cf. A000009, A000720, A001222, A005117, A056239, A265668, A296150, A299755.
%K A319247 nonn,tabf
%O A319247 1,2
%A A319247 _Gus Wiseman_, Sep 15 2018