Column 0 of triangle A132471.

A132472

Column 0 of triangle A132471.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =12a(4) =132a(5) =2200a(6) =50020a(7) =1458576a(8) =52443832a(9) =2262992496a(10) =114895662336

External references