A328039 - OEIS

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A328039

Number of primitive (period n) n-bead bracelet structures which are not periodic palindromes using exactly four different colored beads.

4

0, 0, 0, 1, 2, 10, 32, 129, 468, 1806, 6780, 25917, 98056, 372919, 1414548, 5375974, 20432480, 77773845, 296350460, 1130919576, 4321818986, 16540888897, 63399449652, 243357204415, 935428588930, 3600514267686, 13876474860110, 53546226302319, 206864885150216

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

COMMENTS

Permuting the colors of the beads will not change the structure.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

FORMULA

a(n) = A056368(n) - A056521(n).

CROSSREFS

Column 4 of A309784.

Cf. A056368, A056521, A328035, A328038, A328658.

Sequence in context: A265836 A083099 A032095 * A264960 A151019 A329427

Adjacent sequences: A328036 A328037 A328038 * A328040 A328041 A328042

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Oct 02 2019

STATUS

approved