Row 4 of rectangular table A124530.

Terms

a(0) =1a(1) =1a(2) =5a(3) =25a(4) =113a(5) =608a(6) =3535a(7) =21844a(8) =141809a(9) =959882a(10) =6738850a(11) =48877221a(12) =365145267a(13) =2803002587a(14) =22066904802a(15) =177881536038