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A056461
Number of primitive (aperiodic) palindromes using a maximum of five different symbols.
4
5, 0, 20, 20, 120, 100, 620, 600, 3100, 3000, 15620, 15480, 78120, 77500, 390480, 390000, 1953120, 1949900, 9765620, 9762480, 48827480, 48812500, 244140620, 244124400, 1220703000, 1220625000, 6103512500, 6103437480, 30517578120, 30517184400, 152587890620, 152587500000
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
Sum_{d|n} mu(d)*A056451(n/d).
PROG
(PARI) a(n) = sumdiv(n, d, moebius(d)*5^((1 + n/d)\2));
for(n=1, 40, print1(a(n), ", ")); \\ Petros Hadjicostas, Apr 24 2020
CROSSREFS
Column 5 of A284823.
Sequence in context: A094031 A022902 A291926 * A167355 A282577 A279030
KEYWORD
nonn
EXTENSIONS
More terms from Petros Hadjicostas, Apr 24 2020
STATUS
approved