Row l=4 of array in A133713.

Terms

a(0) =1a(1) =6a(2) =25a(3) =81a(4) =226a(5) =561a(6) =1277a(7) =2706a(8) =5411a(9) =10297a(10) =18788a(11) =33043a(12) =56277a(13) =93148a(14) =150303a(15) =237029a(16) =366135a(17) =554993a(18) =826904a(19) =1212695a(20) =1752761a(21) =2499432a(22) =3519935a(23) =4899801a(24) =6747052a(25) =9196983a(26) =12417949a(27) =16617932a(28) =22052383a(29) =29033069