Bessel polynomials y_n(x) (see A001498) evaluated at 2.

A001517

Bessel polynomials y_n(x) (see A001498) evaluated at 2.

Terms

    a(0) =1a(1) =3a(2) =19a(3) =193a(4) =2721a(5) =49171a(6) =1084483a(7) =28245729a(8) =848456353a(9) =28875761731

External references