Triangle read by rows: T(n, k) = binomial(n, k) + 2*(1 + n! - k! - (n-k)!).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =11a(8) =11a(9) =1a(10) =1a(11) =40a(12) =48a(13) =40a(14) =1a(15) =1a(16) =197a(17) =236a(18) =236a(19) =197a(20) =1a(21) =1a(22) =1206a(23) =1405a(24) =1438a(25) =1405a(26) =1206a(27) =1a(28) =1a(29) =8647