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

A056446

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

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =11a(6) =13a(7) =82a(8) =162a(9) =929a(10) =1369a(11) =13718a(12) =16421a(13) =124689a(14) =355792a(15) =1356698a(16) =2555043a(17) =25933641a(18) =32931815a(19) =283329802a(20) =720489742a(21) =3308253663a(22) =5763641923a(23) =60874684720a(24) =93543112675a(25) =600086794431

External references