A170919 - cp's OEIS frontend

A170919 a(n) = denominator of the coefficient c(n) of x^n in (tan x)/Product_{k=1..n-1} 1 + c(k)*x^k, n = 1, 2, 3, ...

n	a(n)
1	1
2	1
3	3
4	3
5	5
6	45
7	105
8	315
9	2835
10	14175
11	5775
12	467775
13	6081075
14	2837835
15	212837625
16	70945875
17	3618239625
18	97692469875
19	206239658625
20	9280784638125
21	1031198293125
22	142924083427125
23	322279795963125
24	101111706320625
25	136968913284328125
26	161872352063296875

[1, 1, 3, 3, 5, 45, 105, 315, 2835, 14175, 5775, 467775, 6081075, 2837835, 212837625, 70945875, 3618239625, 97692469875, 206239658625, 9280784638125, 1031198293125, 142924083427125, 322279795963125, 101111706320625, 136968913284328125, 161872352063296875]

cp's OEIS Frontend

A170919 a(n) = denominator of the coefficient c(n) of x^n in (tan x)/Product_{k=1..n-1} 1 + c(k)*x^k, n = 1, 2, 3, ...

Table of values

List of values