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 A273731 #6 May 28 2016 20:03:30 %S A273731 1,1,1,1,2,3,4,8,12,16,32,48,64,160,288,448,1024,1728,2560,5632,9216, %T A273731 13312,33280,59904,93184,212992,359424,532480,1171456,1916928,2768896, %U A273731 6922240,12460032,19382272,44302336,74760192,110755840,243662848,398721024,575930368 %N A273731 Number of permutations of n elements divided by the number of ternary heaps on n+1 elements. %H A273731 Alois P. Heinz, <a href="/A273731/b273731.txt">Table of n, a(n) for n = 0..1000</a> %H A273731 Wikipedia, <a href="https://en.wikipedia.org/wiki/D-ary_heap">D-ary heap</a> %F A273731 a(n) = A000142(n)/A178008(n+1). %Y A273731 Column k=3 of A273730. %Y A273731 Cf. A000142, A178008. %K A273731 nonn %O A273731 0,5 %A A273731 _Alois P. Heinz_, May 28 2016