T(n, k) = n! * [x^k] [y^n] sec(z)(x + z*sin(z)/y) where z = y*sqrt(x^2 - 1) for 0 <= k <= n+1 and T(-1, 0) = 1, triangle read by rows.

A326722

T(n, k) = n! * [x^k] [y^n] sec(z)(x + z*sin(z)/y) where z = y*sqrt(x^2 - 1) for 0 <= k <= n+1 and T(-1, 0) = 1, triangle read by rows.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =-1a(4) =0a(5) =1a(6) =0a(7) =-1a(8) =0a(9) =1a(10) =2a(11) =0a(12) =-4a(13) =0a(14) =2a(15) =0a(16) =5a(17) =0a(18) =-10a(19) =0a(20) =5a(21) =-16a(22) =0a(23) =48a(24) =0a(25) =-48a(26) =0a(27) =16a(28) =0a(29) =-61

External references