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 A184275 #16 Oct 31 2017 20:54:10
%S A184275 70,8296,1398500,268447936,54975633976,11728126132976,
%T A184275 2573485510942780,576460752706101376,131176846748288854980,
%U A184275 30223145490448192851232,7033750223212787748164020,1650586719047191292234702976,390046338531762979375904093800
%N A184275 Number of distinct n X 4 toroidal 0..3 arrays.
%H A184275 Andrew Howroyd, <a href="/A184275/b184275.txt">Table of n, a(n) for n = 1..100</a>
%t A184275 T[n_, k_] := (1/(n*k))*Sum[Sum[EulerPhi[c]*EulerPhi[d]*4^(n*k/LCM[c, d]), {d, Divisors[k]}], {c, Divisors[n]}]; a[n_] := T[n, 4]; Array[a, 13] (* _Jean-François Alcover_, Oct 31 2017, after _Andrew Howroyd_ *)
%Y A184275 Column 4 of A184277.
%K A184275 nonn
%O A184275 1,1
%A A184275 _R. H. Hardin_, Jan 10 2011
%E A184275 Terms a(7) and beyond from _Andrew Howroyd_, Sep 27 2017