Number of equivalence classes of base-3 necklaces of length n, where necklaces are considered equivalent under both rotations and permutations of the symbols.

A002076

Number of equivalence classes of base-3 necklaces of length n, where necklaces are considered equivalent under both rotations and permutations of the symbols.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =26a(7) =53a(8) =146a(9) =369a(10) =1002a(11) =2685a(12) =7434a(13) =20441a(14) =57046a(15) =159451a(16) =448686a(17) =1266081a(18) =3588002a(19) =10195277a(20) =29058526a(21) =83018783a(22) =237740670a(23) =682196949a(24) =1961331314a(25) =5648590737a(26) =16294052602a(27) =47071590147a(28) =136171497650a(29) =394427456121

External references