n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 3 |
3 | 3 |
4 | 15 |
5 | 45 |
6 | 198 |
7 | 972 |
8 | 5652 |
9 | 37881 |
10 | 289548 |
11 | 2492640 |
12 | 23906475 |
13 | 253012653 |
14 | 2930556024 |
15 | 36883817127 |
16 | 501315357690 |
17 | 7318715960511 |
18 | 114224260779891 |
19 | 1897913866979529 |
20 | 33449523840512127 |
21 | 623265596538965334 |
22 | 12241892922194658510 |
23 | 252793167644378784006 |
[1,0,3,3,15,45,198,972,5652,37881,289548,2492640, 23906475,253012653,2930556024,36883817127, 501315357690,7318715960511,114224260779891, 1897913866979529,33449523840512127, 623265596538965334,12241892922194658510, 252793167644378784006] |