Array A(i,j) read by antidiagonals: A(i,j) is the (2*i-1)-th derivative of tan(tan(tan(...tan(x)))) nested j times evaluated at 0.

A212267

Array A(i,j) read by antidiagonals: A(i,j) is the (2*i-1)-th derivative of tan(tan(tan(...tan(x)))) nested j times evaluated at 0.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =1a(4) =4a(5) =16a(6) =1a(7) =6a(8) =72a(9) =272a(10) =1a(11) =8a(12) =168a(13) =2896a(14) =7936a(15) =1a(16) =10a(17) =304a(18) =10672a(19) =203904a(20) =353792a(21) =1a(22) =12a(23) =480a(24) =26400a(25) =1198080a(26) =22112000a(27) =22368256a(28) =1a(29) =14

External references