A108217 - cp's OEIS frontend

A108217 a(0) = 1, a(1) = 1, a(n) = n! + (n-2)! for n >= 2.

n	a(n)
0	1
1	1
2	3
3	7
4	26
5	126
6	744
7	5160
8	41040
9	367920
10	3669120
11	40279680
12	482630400
13	6266937600
14	87657292800
15	1313901388800
16	21009968179200
17	356995102464000
18	6423296495616000
19	122000787836928000
20	2439304381882368000
21	51212587272118272000
22	1126433629785784320000

[1, 1, 3, 7, 26, 126, 744, 5160, 41040, 367920, 3669120, 40279680, 482630400, 6266937600, 87657292800, 1313901388800, 21009968179200, 356995102464000, 6423296495616000, 122000787836928000, 2439304381882368000, 51212587272118272000, 1126433629785784320000]

cp's OEIS Frontend

A108217 a(0) = 1, a(1) = 1, a(n) = n! + (n-2)! for n >= 2.

Table of values

List of values