a(n) is the number of permutations on [n] with at least one strong fixed point and no small descents.

A346199

a(n) is the number of permutations on [n] with at least one strong fixed point and no small descents.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =5a(4) =19a(5) =95a(6) =569a(7) =3957a(8) =31455a(9) =281435a(10) =2799981a(11) =30666153a(12) =366646995a(13) =4751669391a(14) =66348304849a(15) =992975080813

External references