Row l=7 of array in A133713.

Terms

a(0) =1a(1) =21a(2) =266a(3) =2541a(4) =20097a(5) =138103a(6) =849514a(7) =4771889a(8) =24828755a(9) =120944516a(10) =556107055a(11) =2429461391a(12) =10137839293a(13) =40585353434a(14) =156451707633a(15) =582555425669