Triangle of coefficients arising in expansion of n-th derivative of tan(x) + sec(x).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =4a(8) =5a(9) =2a(10) =1a(11) =8a(12) =18a(13) =16a(14) =5a(15) =1a(16) =16a(17) =58a(18) =88a(19) =61a(20) =16a(21) =1a(22) =32a(23) =179a(24) =416a(25) =479a(26) =272a(27) =61a(28) =1a(29) =64