Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 12 and t = 12.

A324133

Number of permutations of [n] that avoid the shuffle pattern s-k-t, where s = 12 and t = 12.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =114a(6) =608a(7) =3554a(8) =22480a(9) =152546a(10) =1103200a(11) =8456994a(12) =68411632a(13) =581745250a(14) =5183126016a(15) =48245682338a(16) =467988498064

External references