Number of permutations of [n] having exactly one strong fixed block.

A225960

Number of permutations of [n] having exactly one strong fixed block.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =3a(4) =9a(5) =38a(6) =198a(7) =1229a(8) =8819a(9) =71825a(10) =654985a(11) =6615932a(12) =73357572a(13) =886078937a(14) =11583028581a(15) =162939646239

External references