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A285042 Number of primitive (period n) periodic palindromic structures of length n using an infinite alphabet. 1
1, 1, 1, 3, 4, 10, 14, 36, 50, 138, 202, 562, 876, 2589, 4134, 12828, 21146, 69115, 115974, 398619, 678554, 2450202, 4213596, 15939338, 27644432, 109304036, 190899270 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

See A285037 for additional information. Permuting the symbols will not change the structure.

LINKS

Table of n, a(n) for n=1..27.

FORMULA

a(n) = Sum_{d | n} mu(n/d) * A285013(d).

CROSSREFS

Row sums of A285037.

Sequence in context: A056515 A056516 A056517 * A319719 A048155 A242342

Adjacent sequences:  A285039 A285040 A285041 * A285043 A285044 A285045

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Apr 08 2017

STATUS

approved

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Last modified August 24 13:48 EDT 2019. Contains 326279 sequences. (Running on oeis4.)