A327874 - OEIS

%I #8 Oct 03 2019 20:59:32

%S 1,1,0,2,2,12,10,74,72,538,528,4682,4668,47292,47218,545820,545760,

%T 7087260,7086710,102247562,102247020,1622632496,1622627890,

%U 28091567594,28091562840,526858348368,526858301088,10641342969902,10641342923148,230283190977852,230283190431480

%N Number of length n primitive (aperiodic) palindromes with integer entries that cover an initial interval of positive integers.

%H Andrew Howroyd, <a href="/A327874/b327874.txt">Table of n, a(n) for n = 0..200</a>

%F a(n) = Sum_{d|n} mu(n/d)*A000670(ceiling(d/2)) for n > 0.

%o (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 Row sums of A327873.

%Y Cf. A000670, A327879.

%K nonn

%O 0,4

%A _Andrew Howroyd_, Sep 28 2019