A272481 - cp's OEIS frontend

A272481 E.g.f. A(x,y) = cos((x - xy)/2) / cos((x + xy)/2) represented as a triangle, read by rows, where row n lists of coefficients T(n,k) of x^(2n)y^k/n! in A(x,y), for k=0..2*n.

n	a(n)
0	1
1	0
2	1
3	0
4	0
5	1
6	3
7	1
8	0
9	0
10	3
11	15
12	25
13	15
14	3
15	0
16	0
17	17
18	119
19	329
20	455
21	329
22	119
23	17
24	0
25	0
26	155
27	1395
28	5325
29	11235
30	14301
31	11235
32	5325
33	1395
34	155
35	0
36	0
37	2073
38	22803
39	110605
40	311355
41	563013
42	683067
43	563013
44	311355
45	110605
46	22803
47	2073
48	0
49	0
50	38227
51	496951
52	2918825
53	10241231
54	23904881
55	39102063
56	45956625
57	39102063
58	23904881
59	10241231
60	2918825
61	496951
62	38227
63	0
64	0
65	929569
66	13943535
67	96075665
68	403075855
69	1150348017
70	2362479119
71	3600524785
72	4136759055
73	3600524785
74	2362479119
75	1150348017
76	403075855
77	96075665
78	13943535
79	929569
80	0

[1, 0, 1, 0, 0, 1, 3, 1, 0, 0, 3, 15, 25, 15, 3, 0, 0, 17, 119, 329, 455, 329, 119, 17, 0, 0, 155, 1395, 5325, 11235, 14301, 11235, 5325, 1395, 155, 0, 0, 2073, 22803, 110605, 311355, 563013, 683067, 563013, 311355, 110605, 22803, 2073, 0, 0, 38227, 496951, 2918825, 10241231, 23904881, 39102063, 45956625, 39102063, 23904881, 10241231, 2918825, 496951, 38227, 0, 0, 929569, 13943535, 96075665, 403075855, 1150348017, 2362479119, 3600524785, 4136759055, 3600524785, 2362479119, 1150348017, 403075855, 96075665, 13943535, 929569, 0]

cp's OEIS Frontend

A272481 E.g.f. A(x,y) = cos((x - xy)/2) / cos((x + xy)/2) represented as a triangle, read by rows, where row n lists of coefficients T(n,k) of x^(2n)y^k/n! in A(x,y), for k=0..2*n.

Table of values

List of values

cp's OEIS Frontend

A272481 E.g.f. A(x,y) = cos((x - x*y)/2) / cos((x + x*y)/2) represented as a triangle, read by rows, where row n lists of coefficients T(n,k) of x^(2*n)*y^k/n! in A(x,y), for k=0..2*n.

Table of values

List of values

A272481 E.g.f. A(x,y) = cos((x - xy)/2) / cos((x + xy)/2) represented as a triangle, read by rows, where row n lists of coefficients T(n,k) of x^(2n)y^k/n! in A(x,y), for k=0..2*n.