A185896 - cp's OEIS frontend

A185896 Triangle of coefficients of (1/sec^2(x))*D^n(sec^2(x)) in powers of t = tan(x), where D = d/dx.

n	a(n)
0	1
1	0
2	2
3	2
4	0
5	6
6	0
7	16
8	0
9	24
10	16
11	0
12	120
13	0
14	120
15	0
16	272
17	0
18	960
19	0
20	720
21	272
22	0
23	3696
24	0
25	8400
26	0
27	5040
28	0
29	7936
30	0
31	48384
32	0
33	80640
34	0
35	40320
36	7936
37	0
38	168960
39	0
40	645120
41	0
42	846720
43	0
44	362880
45	0
46	353792
47	0
48	3256320
49	0
50	8951040
51	0
52	9676800
53	0
54	3628800

[1, 0, 2, 2, 0, 6, 0, 16, 0, 24, 16, 0, 120, 0, 120, 0, 272, 0, 960, 0, 720, 272, 0, 3696, 0, 8400, 0, 5040, 0, 7936, 0, 48384, 0, 80640, 0, 40320, 7936, 0, 168960, 0, 645120, 0, 846720, 0, 362880, 0, 353792, 0, 3256320, 0, 8951040, 0, 9676800, 0, 3628800]

cp's OEIS Frontend

A185896 Triangle of coefficients of (1/sec^2(x))*D^n(sec^2(x)) in powers of t = tan(x), where D = d/dx.

Table of values

List of values