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 A379975 #5 Jan 11 2025 04:00:13 %S A379975 0,1,3,8,5,6,11,10,20,24,18,34,17,25,15,46,33,34,26,73,28,106,145,190, %T A379975 204,241,162,298,113,361,103,430,505,586,673,766,865,970,1081,624, %U A379975 1198,1321,420,1450,1585,1726 %N A379975 A373711(n) is equal to the a(n)-th A379973(n)-gonal pyramidal number. %C A379975 Indices to pyramidal numbers are chosen so that the first k-gonal pyramidal number is 1 (and the zeroth is 0). %F A379975 A080851(A379973(n)-2,a(n)-1) = A373711(n). %Y A379975 Cf. A080851, A373711, A379973, A379974. %K A379975 nonn,more %O A379975 1,3 %A A379975 _Pontus von Brömssen_, Jan 08 2025