Number of step cyclic shifted sequences using a maximum of four different symbols.

A056412

Number of step cyclic shifted sequences using a maximum of four different symbols.

Terms

    a(0) =4a(1) =10a(2) =20a(3) =55a(4) =76a(5) =430a(6) =460a(7) =2605a(8) =5164a(9) =26962a(10) =38572a(11) =367645a(12) =431780a(13) =3203430a(14) =8993804a(15) =33860125a(16) =63177820a(17) =636462350a(18) =803796700a(19) =6886280971a(20) =17456594380a(21) =79965550558a(22) =139069427020

External references