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 A333916 #20 Apr 12 2020 10:25:18 %S A333916 4,10,30,550,1540,48070,223300,2634940,402610950,1570545340, %T A333916 13960282700,5677137442900,248297918605660 %N A333916 a(n) is the least integer that is pyramidal in exactly n ways. %C A333916 a(n) has exactly n representations as an m-gonal pyramidal number P(m, k) = k*(k + 1)*(k*(m - 2) - m + 5) / 6, with m > 2, k > 1. %C A333916 a(12) > 5*10^11. - _Giovanni Resta_, Apr 11 2020 %H A333916 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PyramidalNumber.html">Pyramidal Number</a> %H A333916 <a href="/index/Ps#pyramidal_numbers">Index to sequences related to pyramidal numbers</a> %e A333916 a(3) = 30 because 30 is the least integer which is pyramidal in 3 ways (30 is the fourth square pyramidal number, the third octagonal pyramidal number and also the second 31-gonal pyramidal number). %Y A333916 Cf. A063778, A080851, A261720, A333915. %K A333916 nonn,more %O A333916 1,1 %A A333916 _Ilya Gutkovskiy_, Apr 09 2020 %E A333916 a(9) from _Jinyuan Wang_, Apr 10 2020 %E A333916 a(10)-a(11) from _Giovanni Resta_, Apr 10 2020 %E A333916 a(12)-a(13) from _Bert Dobbelaere_, Apr 12 2020