Triangle T(n, k) = 40^(k*(n-k)), read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =40a(5) =1a(6) =1a(7) =1600a(8) =1600a(9) =1a(10) =1a(11) =64000a(12) =2560000a(13) =64000a(14) =1a(15) =1a(16) =2560000a(17) =4096000000a(18) =4096000000a(19) =2560000a(20) =1a(21) =1a(22) =102400000a(26) =102400000a(27) =1a(28) =1a(29) =4096000000a(34) =4096000000a(35) =1