n | a(n) |
---|---|
1 | -1 |
2 | 1 |
3 | 5 |
4 | 20 |
5 | 77 |
6 | 294 |
7 | 1122 |
8 | 4290 |
9 | 16445 |
10 | 63206 |
11 | 243542 |
12 | 940576 |
13 | 3640210 |
14 | 14115100 |
15 | 54826020 |
16 | 213286590 |
17 | 830905245 |
18 | 3241119750 |
19 | 12657425550 |
20 | 49483369320 |
21 | 193641552390 |
22 | 758454277620 |
23 | 2973183318300 |
24 | 11664026864100 |
25 | 45791597230002 |
26 | 179892016853724 |
[-1,1,5,20,77,294,1122,4290,16445,63206,243542, 940576,3640210,14115100,54826020,213286590, 830905245,3241119750,12657425550,49483369320, 193641552390,758454277620,2973183318300, 11664026864100,45791597230002,179892016853724] |