A005359 - cp's OEIS frontend

A005359 a(n) = n! if n is even, otherwise 0 (from Taylor series for cos x).

n	a(n)
0	1
1	0
2	2
3	0
4	24
5	0
6	720
7	0
8	40320
9	0
10	3628800
11	0
12	479001600
13	0
14	87178291200
15	0
16	20922789888000
17	0
18	6402373705728000
19	0
20	2432902008176640000
21	0
22	1124000727777607680000
23	0
24	620448401733239439360000
25	0

[1, 0, 2, 0, 24, 0, 720, 0, 40320, 0, 3628800, 0, 479001600, 0, 87178291200, 0, 20922789888000, 0, 6402373705728000, 0, 2432902008176640000, 0, 1124000727777607680000, 0, 620448401733239439360000, 0]

cp's OEIS Frontend

A005359 a(n) = n! if n is even, otherwise 0 (from Taylor series for cos x).

Table of values

List of values