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 A379974 #6 Jan 11 2025 04:00:04 %S A379974 0,1,4,15,7,9,22,19,55,70,45,119,41,73,34,181,110,115,77,361,86,631, %T A379974 1009,1513,1683,2161,1191,2971,694,3961,604,5149,6553,8191,10081, %U A379974 12241,14689,17443,20521,9000,23941,27721,4970,31879,36433,41401 %N A379974 A373711(n) is equal to the a(n)-th A379973(n)-gonal number. %C A379974 Indices to polygonal numbers are chosen so that the first k-gonal number is 1 (and the zeroth is 0). %F A379974 A057145(A379973(n),a(n)) = A373711(n). %Y A379974 Cf. A057145, A373711, A379973, A379975. %K A379974 nonn,more %O A379974 1,3 %A A379974 _Pontus von Brömssen_, Jan 08 2025