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 A049832 #10 Aug 08 2021 03:45:31 %S A049832 0,1,4,7,15,18,31,40,50,61,88,87,119,136,151,170,210,225,270,273,307, %T A049832 342,411,396,448,501,532,563,649,626,727,750,810,875,908,923,1029, %U A049832 1094,1159,1166,1300,1275,1432,1443,1491,1608,1741,1698,1802,1897,1974,2029 %N A049832 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 A049828. %Y A049832 Cf. A049828. %K A049832 nonn %O A049832 1,3 %A A049832 _Clark Kimberling_ %E A049832 More terms from _Sean A. Irvine_, Aug 07 2021