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A056462
Number of primitive (aperiodic) palindromes using a maximum of six different symbols.
4
6, 0, 30, 30, 210, 180, 1290, 1260, 7740, 7560, 46650, 46410, 279930, 278640, 1679370, 1678320, 10077690, 10069740, 60466170, 60458370, 362795730, 362750400, 2176782330, 2176734420, 13060693800, 13060414080, 78364156320, 78363884130, 470184984570, 470183297220
OFFSET
1,1
REFERENCES
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
FORMULA
a(n) = Sum_{d|n} mu(d)*A056452(n/d).
PROG
(PARI) a(n) = sumdiv(n, d, moebius(d)*6^((1 + n/d)\2));
for(n=1, 32, print1(a(n), ", ")); \\ Petros Hadjicostas, Apr 24 2020
CROSSREFS
Column 6 of A284823.
Sequence in context: A287470 A138704 A005396 * A249869 A209446 A375237
KEYWORD
nonn
EXTENSIONS
More terms from Petros Hadjicostas, Apr 24 2020
STATUS
approved