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 A333915 #7 Apr 09 2020 23:49:55 %S A333915 1,1,1,1,1,1,2,1,1,1,2,1,1,1,2,1,2,1,2,1,1,1,2,1,1,1,3,1,1,1,2,2,1,1, %T A333915 2,1,2,1,2,1,1,1,2,1,1,1,3,1,1,1,2,2,2,1,2,1,2,1,2,1,1,1,2,1,1,1,3,1, %U A333915 1,1,2,2,1,1,2,1,2,1,2,1,2,1,2,1,1,1,3,2,1,1,2,2,1,1,2,1,2 %N A333915 Number of ways to represent n as a pyramidal number. %C A333915 Frequency of n in the array A261720 of pyramidal numbers. %H A333915 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PyramidalNumber.html">Pyramidal Number</a> %H A333915 <a href="/index/Ps#pyramidal_numbers">Index to sequences related to pyramidal numbers</a> %e A333915 a(10) = 2 because 10 is the third tetrahedral (or triangular pyramidal) number and also the second 9-gonal pyramidal number. %e A333915 a(30) = 3 because 30 is the fourth square pyramidal number, the third octagonal pyramidal number and also the second 29-gonal pyramidal number. %Y A333915 Cf. A080851, A129654, A177025, A261720, A333916. %K A333915 nonn %O A333915 4,7 %A A333915 _Ilya Gutkovskiy_, Apr 09 2020