Number of step cyclic shifted sequence structures using exactly four different symbols.

A056436

Number of 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) =83a(8) =162a(9) =930a(10) =1369a(11) =13730a(12) =16421a(13) =124702a(14) =355793a(15) =1356781a(16) =2555043a(17) =25933814a(18) =32931815a(19) =283330733a(20) =720489755a(21) =3308255032a(22) =5763641923a(23) =60874698532a(24) =93543112676a(25) =600086810852

External references