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 A351888 #14 Feb 24 2022 22:52:42 %S A351888 1,1,6,196,33620,29805312,135418115000,3137323702689792, %T A351888 369428717972011445136,220611233969267102720000000, %U A351888 667057613878412272119535551460192,10200716038735515318755655819186313101312,788214513968528761154292411214871546938048625472 %N A351888 Number of spanning trees of the graph acquired by placing a vertex in each of the n^2 cells of a triangle of size n in a triangular grid and placing edges between two vertices whenever two cells share a side. %C A351888 Conjecture: For each k there exists a sufficiently large N, such that for all n > N, if p_1, p_2, ..., p_k are the k largest primes that divide a(n) then (p_1*p_2*...*p_k)^2 also divides a(n). %H A351888 Peter Kagey, <a href="/A351888/b351888.txt">Table of n, a(n) for n = 1..50</a> %H A351888 Peter Kagey, <a href="/A351888/a351888.png">One of the a(9) = 369428717972011445136 spanning trees on a triangle of size 9</a>. %K A351888 nonn %O A351888 1,3 %A A351888 _Peter Kagey_, Feb 23 2022