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 A193848 #10 Feb 18 2024 14:43:50
%S A193848 1,2,4,4,14,13,8,40,68,40,16,104,256,284,121,32,256,824,1336,1094,364,
%T A193848 64,608,2416,5144,6196,4010,1093,128,1408,6656,17536,27824,26608,
%U A193848 14216,3280,256,3200,17536,55040,108256,136688,108256,49208,9841,512
%N A193848 Triangular array: (1/2)*A193846.
%H A193848 Andrew Howroyd, <a href="/A193848/b193848.txt">Table of n, a(n) for n = 0..1325</a> (rows 0..50)
%F A193848 G.f.: 1/(1 - 2*(1 + 2*y)*x + y*(2 + 3*y)*x^2). - _Andrew Howroyd_, Feb 18 2024
%e A193848 Triangle begins:
%e A193848 1;
%e A193848 2, 4;
%e A193848 4, 14, 13;
%e A193848 8, 40, 68, 40;
%e A193848 16, 104, 256, 284, 121;
%e A193848 32, 256, 824, 1336, 1094, 364;
%e A193848 64, 608, 2416, 5144, 6196, 4010, 1093;
%e A193848 128, 1408, 6656, 17536, 27824, 26608, 14216, 3280;
%e A193848 ...
%t A193848 (See A193846.)
%o A193848 (PARI) T(n)={[Vecrev(p) | p<-Vec(1/(1 - 2*(1 + 2*y)*x + y*(2 + 3*y)*x^2) + O(x*x^n))]}
%o A193848 { my(A=T(10)); for(i=1, #A, print(A[i])) } \\ _Andrew Howroyd_, Feb 18 2024
%Y A193848 Cf. A193846.
%K A193848 nonn,tabl
%O A193848 0,2
%A A193848 _Clark Kimberling_, Aug 07 2011