Number of step shifted (decimated) sequence structures of length n using an infinite alphabet.
A288621
Number of step shifted (decimated) sequence structures of length n using an infinite alphabet.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =11a(4) =18a(5) =117a(6) =162a(7) =1205a(8) =3621a(9) =29271a(10) =68086a(11) =1069614a(12) =2305158a(13) =31825670a(14) =172974370a(15) =1311400891a(16) =5179123522a(17) =113680235941a(18) =324041807958
External references
- oeis: A288621