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 A048217 #9 Jun 06 2021 02:52:24 %S A048217 1,5,11,19,28,40,55,71,91,113,137,162,188,220,253,287,324,362,403,448, %T A048217 495,543,596,652,711,772,834,898,966,1035,1109,1185,1262,1340,1421, %U A048217 1505,1592,1680,1769,1865,1963,2063,2166,2271,2377 %N A048217 a(n)=T(n+1,n), array T given by A048212. %F A048217 a(n) = A004979(n + 2) - 3. - _Sean A. Irvine_, Jun 05 2021 %Y A048217 Cf. A004979. %K A048217 nonn %O A048217 1,2 %A A048217 _Clark Kimberling_