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 A327874 #8 Oct 03 2019 20:59:32
%S A327874 1,1,0,2,2,12,10,74,72,538,528,4682,4668,47292,47218,545820,545760,
%T A327874 7087260,7086710,102247562,102247020,1622632496,1622627890,
%U A327874 28091567594,28091562840,526858348368,526858301088,10641342969902,10641342923148,230283190977852,230283190431480
%N A327874 Number of length n primitive (aperiodic) palindromes with integer entries that cover an initial interval of positive integers.
%H A327874 Andrew Howroyd, <a href="/A327874/b327874.txt">Table of n, a(n) for n = 0..200</a>
%F A327874 a(n) = Sum_{d|n} mu(n/d)*A000670(ceiling(d/2)) for n > 0.
%o A327874 (PARI) a(n) = {if(n<1, n==0, sumdiv(n, d, moebius(n/d)*sum(k=1, ceil(d/2), k!*stirling(ceil(d/2), k, 2))))}
%Y A327874 Row sums of A327873.
%Y A327874 Cf. A000670, A327879.
%K A327874 nonn
%O A327874 0,4
%A A327874 _Andrew Howroyd_, Sep 28 2019