Number of primitive (period n) step cyclic shifted sequences using a maximum of three different symbols.

A056420

Number of primitive (period n) step cyclic shifted sequences using a maximum of three different symbols.

Terms

    a(0) =3a(1) =3a(2) =7a(3) =15a(4) =21a(5) =79a(6) =75a(7) =306a(8) =433a(9) =1605a(10) =1695a(11) =12662a(12) =10461a(13) =57759a(14) =122791a(15) =347895a(16) =476049a(17) =3596917a(18) =3401967a(19) =22005312a(20) =41597289a(21) =142675887a(22) =186077883a(23) =1476684552a(24) =1694657979a(25) =8147271993a(26) =15690973311

External references