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 A048216 #21 Jun 06 2021 02:52:45 %S A048216 2,3,7,13,21,30,42,57,73,93,115,139,164,190,222,255,289,326,364,405, %T A048216 450,497,545,598,654,713,774,836,900,968,1037,1111,1187,1264,1342, %U A048216 1423,1507,1594,1682,1771,1867,1965,2065,2168,2273,2379 %N A048216 a(n) = T(n,n), where array T is given by A048212. %C A048216 a(1) = 2, a(2) = 3 and a(i) is the next smallest number greater than a(i-1) such that a(i) - a(j) is not a(1) or a(m) or a(m) - a(n) with 1 <= j < i, 1 <= n < m < i. - _Ben Paul Thurston_, Feb 18 2019 %F A048216 a(n) = A004979(n + 1) - 1. - _Sean A. Irvine_, Jun 05 2021 %Y A048216 Cf. A004979, A048212. %K A048216 nonn %O A048216 1,1 %A A048216 _Clark Kimberling_