Triangle read by rows: T(i,j) for the recurrence T(i,j) = (T(i-1,j) + 1)*i.

Terms

a(0) =1a(1) =4a(2) =2a(3) =15a(4) =9a(5) =3a(6) =64a(7) =40a(8) =16a(9) =4a(10) =325a(11) =205a(12) =85a(13) =25a(14) =5a(15) =1956a(16) =1236a(17) =516a(18) =156a(19) =36a(20) =6a(21) =13699a(22) =8659a(23) =3619a(24) =1099a(25) =259a(26) =49a(27) =7a(28) =109600a(29) =69280