Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of three different symbols.

A056382

Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of three different symbols.

Terms

    a(0) =3a(1) =6a(2) =15a(3) =45a(4) =69a(5) =381a(6) =387a(7) =1890a(8) =3393a(9) =14907a(10) =17799a(11) =139518a(12) =133101a(13) =798129a(14) =1804431a(15) =5452434a(16) =8072529a(17) =64596051a(18) =64573623a(19) =437717394a(20) =872156889a(21) =3138141621a(22) =4279259571a(23) =35361942282a(24) =42364514331

External references