Triangle read by rows: T(n,k) = value of (d^2n/dx^2n) (tan^(2k)(x)/cos(x)) at the point x = 0.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =28a(5) =24a(6) =61a(7) =662a(8) =1320a(9) =720a(10) =1385a(11) =24568a(12) =83664a(13) =100800a(14) =40320a(15) =50521a(16) =1326122a(17) =6749040a(18) =13335840a(19) =11491200a(20) =3628800a(21) =2702765a(22) =98329108a(23) =692699304a(24) =1979524800a(25) =2739623040a(26) =1836172800a(27) =479001600a(28) =199360981a(29) =9596075582