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 A152905 #5 May 26 2024 11:55:15
%S A152905 1,1,1,1,1,1,1,1,2,2,1,1,1,1,3,3,3,3,1,1,1,1,4,4,6,6,4,4,1,1,1,1,5,5,
%T A152905 10,10,10,10,5,5,1,1,1,1,6,6,15,15,20,20,15,15,6,6,1,1,1,1,7,7,21,21,
%U A152905 35,35,35,35,21,21,7,7,1,1,1,1,8,8,28,28,56,56,70,70,56,56,28,28,8,8,1,1
%N A152905 Irregular triangle read by rows, numbers in A007318 repeated .
%C A152905 Diagonal sums : A097333 .
%F A152905 Sum_{k, 0<=k<=2n}T(n,k)=2^(n+1).
%e A152905 Triangle begins : 1,1 ; 1,1,1,1 ; 1,1,2,2,1,1 ; 1,1,3,3,3,3,1,1, ; 1,1,4,4,6,6,4,4,1,1 ; 1,1,5,5,10,10,10,10,5,5,1,1 ; ...
%Y A152905 Cf. A000079,
%K A152905 nonn,tabf
%O A152905 0,9
%A A152905 _Philippe Deléham_, Dec 14 2008
%E A152905 Typo in a(74) corrected by _Georg Fischer_, May 26 2024