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 A049776 #8 Aug 03 2017 01:39:15
%S A049776 1,1,2,1,4,1,3,6,8,1,7,10,16,1,5,11,15,18,22,28,32,1,13,19,31,34,46,
%T A049776 52,64,1,9,21,29,35,43,55,63,66,74,86,94,100,108,120,128,1,25,37,61,
%U A049776 67,91,103,127,130,154,166,190,196,220,232,256
%N A049776 Triangular array T read by rows: n-th row consists of fixed points, k, of n-th row of array t given by A049773; i.e., t(n, t(n,k)) = t(n,k).
%e A049776 Rows: {1}; {1,2}; {1,4}; {1,3,6,8}; ...
%K A049776 nonn,tabl
%O A049776 1,3
%A A049776 _Clark Kimberling_