A151775 - cp's OEIS frontend

A151775 Triangle read by rows: T(n,k) = value of (d^2n/dx^2n) (tan^(2k)(x)/cos(x)) at the point x = 0.

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

[1, 1, 2, 5, 28, 24, 61, 662, 1320, 720, 1385, 24568, 83664, 100800, 40320, 50521, 1326122, 6749040, 13335840, 11491200, 3628800, 2702765, 98329108, 692699304, 1979524800, 2739623040, 1836172800, 479001600, 199360981, 9596075582]

cp's OEIS Frontend

A151775 Triangle read by rows: T(n,k) = value of (d^2n/dx^2n) (tan^(2k)(x)/cos(x)) at the point x = 0.

Table of values

List of values