n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 4 |
3 | 3 |
4 | 35 |
5 | 112 |
6 | 533 |
7 | 2163 |
8 | 9316 |
9 | 39215 |
10 | 166519 |
11 | 704736 |
12 | 2986361 |
13 | 12648727 |
14 | 53583620 |
15 | 226979403 |
16 | 961507387 |
17 | 4072998992 |
18 | 17253519469 |
19 | 73087050795 |
20 | 309601764836 |
21 | 1311494041879 |
22 | 5555578042799 |
23 | 23533806034368 |
24 | 99690802469425 |
25 | 422297015444207 |
[1,-1,4,3,35,112,533,2163,9316,39215,166519, 704736,2986361,12648727,53583620,226979403, 961507387,4072998992,17253519469,73087050795, 309601764836,1311494041879,5555578042799, 23533806034368,99690802469425,422297015444207] |