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 A152907 #3 Sep 08 2013 13:31:32
%S A152907 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,1,1,1,1,1,1,1,1,3,3,3,3,3,3,
%T A152907 3,3,1,1,1,1,1,1,1,1,4,4,4,4,6,6,6,6,4,4,4,4,1,1,1,1,1,1,1,1,5,5,5,5,
%U A152907 10,10,10,10,10,10,10,10,5,5,5,5,1,1,1,1,1,1,1,1,6,6,6,6,15,15,15,15,20,20
%N A152907 Irregular triangle read by rows, numbers in A007318 repeated four times .
%F A152907 Sum_{k, 0<=k<=4n+3}T(n,k)=2^(n+2).
%e A152907 Triangle begins : 1,1,1,1 ; 1,1,1,1,1,1,1,1 ; 1,1,1,1,2,2,2,2,1,1,1,1 ; 1,1,1,1,3,3,3,3,3,3,3,3,1,1,1,1, ; 1,1,1,1,4,4,4,4,6,6,6,6,4,4,4,4,1,1,1,1 ; 1,1,1,1,5,5,5,5,10,10,10,10,10,10,10,10,5,5,5,5,1,1,1,1 ; ...
%Y A152907 Cf. A007318, A152905, A152906
%K A152907 nonn,tabf
%O A152907 0,17
%A A152907 _Philippe Deléham_, Dec 14 2008