Number of permutations of [n] having exactly one adjacent 3-cycle.

A370525

Number of permutations of [n] having exactly one adjacent 3-cycle.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =6a(6) =22a(7) =114a(8) =696a(9) =4923a(10) =39612a(11) =357900a(12) =3588836a(13) =39556420a(14) =475392840a(15) =6187284605a(16) =86701097310

External references