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A327874
Number of length n primitive (aperiodic) palindromes with integer entries that cover an initial interval of positive integers.
3
1, 1, 0, 2, 2, 12, 10, 74, 72, 538, 528, 4682, 4668, 47292, 47218, 545820, 545760, 7087260, 7086710, 102247562, 102247020, 1622632496, 1622627890, 28091567594, 28091562840, 526858348368, 526858301088, 10641342969902, 10641342923148, 230283190977852, 230283190431480
OFFSET
0,4
LINKS
FORMULA
a(n) = Sum_{d|n} mu(n/d)*A000670(ceiling(d/2)) for n > 0.
PROG
(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))))}
CROSSREFS
Row sums of A327873.
Sequence in context: A350784 A376978 A307659 * A190295 A228154 A275279
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Sep 28 2019
STATUS
approved