Number of primitive (period n) step cyclic shifted sequences using exactly four different symbols.

A056426

Number of primitive (period n) step cyclic shifted sequences using exactly four different symbols.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =3a(4) =12a(5) =136a(6) =204a(7) =1434a(8) =3520a(9) =20688a(10) =31956a(11) =317374a(12) =390364a(13) =2973332a(14) =8504708a(15) =32469954a(16) =61276740a(17) =622084744a(18) =790198476a(19) =6798276744a(20) =17290257884a(21) =79394924652a(22) =138325216092

External references