A193473 - cp's OEIS frontend

A193473 Denominator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.

n	a(n)
0	1
1	2
2	6
3	56
4	30
5	992
6	42
7	16256
8	30
9	261632
10	66
11	4192256
12	2730
13	67100672
14	6
15	1073709056
16	510
17	17179738112
18	798
19	274877382656
20	330
21	628292059136
22	138
23	70368735789056
24	2730
25	1125899873288192
26	6
27	18014398375264256
28	870

[1, 2, 6, 56, 30, 992, 42, 16256, 30, 261632, 66, 4192256, 2730, 67100672, 6, 1073709056, 510, 17179738112, 798, 274877382656, 330, 628292059136, 138, 70368735789056, 2730, 1125899873288192, 6, 18014398375264256, 870]

cp's OEIS Frontend

A193473 Denominator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.

Table of values

List of values