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 A291070 #17 Aug 09 2018 10:23:28
%S A291070 30,990,32730,1047540,33554370,1073708010,34359738210,1099510578960,
%T A291070 35184372055560,1125899873286210,36028797018961890,
%U A291070 1152921503532053580,36893488147419095010,1180591620683051547810,37778931862957128089670,1208925819613529663013120
%N A291070 Number of 4 X n binary matrices that are "primitive"; that is, they cannot be expressed as a "tiling" by a smaller matrix.
%H A291070 Guilhem Gamard, Gwenaël Richomme, Jeffrey Shallit, Taylor J. Smith, <a href="https://arxiv.org/abs/1602.06915">Periodicity in rectangular arrays</a>, arXiv:1602.06915 [cs.DM], 2016; Information Processing Letters 118 (2017) 58-63. See Table 1.
%t A291070 Psi[k_, m_, n_] := Sum[MoebiusMu[dm] MoebiusMu[dn] k^(m n/dm/dn), {dm, Divisors[m] }, {dn, Divisors[n]}];
%t A291070 Table[Psi[2, 5, n], {n, 1, 16}] (* _Jean-François Alcover_, Aug 09 2018, after _Lars Blomberg_ *)
%o A291070 (PARI) Psi(k,m,n) = v1=divisors(m); v2=divisors(n); sum(i1=1,length(v1),sum(i2=1,length(v2),moebius(v1[i1])*moebius(v2[i2])*k^(m*n/v1[i1]/v2[i2])));
%o A291070 vector(16,n,Psi(2,5,n)) \\ _Lars Blomberg_, Aug 19 2017
%Y A291070 Cf. A027375, A102536, A265627, A290754, A291071.
%K A291070 nonn
%O A291070 1,1
%A A291070 _N. J. A. Sloane_, Aug 18 2017
%E A291070 a(8)-a(16) from _Lars Blomberg_, Aug 19 2017