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 A049826 #13 Nov 27 2023 14:17:08 %S A049826 0,1,3,4,8,7,13,14,16,17,27,20,32,31,31,34,46,41,55,44,50,55,73,54,68, %T A049826 73,75,72,96,71,101,90,96,105,101,92,124,119,123,110,146,113,155,132, %U A049826 132,151,177,138,164,161,169,164,204,167,183,166,192,201,231,176 %N A049826 a(n) = T(n,n) + T(n+1,n) + ... + T(2n-1,n) = sum over a period of n-th column of array T given by A049816. %C A049826 a(n) = sum of terms in row n of A051010. %H A049826 Alois P. Heinz, <a href="/A049826/b049826.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from T. D. Noe) %Y A049826 Cf. A049816, A051010. %K A049826 nonn %O A049826 1,3 %A A049826 _Clark Kimberling_