A001120 - cp's OEIS frontend

A001120 a(0) = a(1) = 1; for n > 1, a(n) = n*a(n-1) + (-1)^n.

n	a(n)
0	1
1	1
2	3
3	8
4	33
5	164
6	985
7	6894
8	55153
9	496376
10	4963761
11	54601370
12	655216441
13	8517813732
14	119249392249
15	1788740883734
16	28619854139745
17	486537520375664
18	8757675366761953
19	166395831968477106
20	3327916639369542121
21	69886249426760384540
22	1537497487388728459881

[1, 1, 3, 8, 33, 164, 985, 6894, 55153, 496376, 4963761, 54601370, 655216441, 8517813732, 119249392249, 1788740883734, 28619854139745, 486537520375664, 8757675366761953, 166395831968477106, 3327916639369542121, 69886249426760384540, 1537497487388728459881]

cp's OEIS Frontend

A001120 a(0) = a(1) = 1; for n > 1, a(n) = n*a(n-1) + (-1)^n.

Table of values

List of values