Triangle T(n, k) = T(n-1, k) + T(n-1, k-1) + ((n+1)*(n+2)*(2*n+3)/6)*T(n-2, k-1), read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =16a(5) =1a(6) =1a(7) =47a(8) =47a(9) =1a(10) =1a(11) =103a(12) =974a(13) =103a(14) =1a(15) =1a(16) =195a(17) =5354a(18) =5354a(19) =195a(20) =1a(21) =1a(22) =336a(23) =19969a(24) =147068a(25) =19969a(26) =336a(27) =1a(28) =1a(29) =541