A328039 Number of primitive (period n) n-bead bracelet structures which are not periodic palindromes using exactly four different colored beads.

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

Offset: 1

Author

Andrew Howroyd, Oct 02 2019

Keywords

• nonn

Comments

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

Links

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

Crossrefs

Column 4 of A309784.

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

Formula

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