Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 1 and t = 1234.

A324132

Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 1 and t = 1234.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =715a(7) =4946a(8) =38963a(9) =344350a(10) =3374300a(11) =36309360a(12) =425630742a(13) =5398849407a(14) =73675463140

External references