n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 75 |
6 | 312 |
7 | 1421 |
8 | 7016 |
9 | 37260 |
10 | 211470 |
11 | 1275725 |
12 | 8142840 |
13 | 54776761 |
14 | 387022118 |
15 | 2863489830 |
16 | 22127336720 |
17 | 178162416499 |
18 | 1491567656472 |
19 | 12959459317021 |
20 | 116654844101140 |
21 | 1086207322942812 |
22 | 10447135955448522 |
23 | 103654461984288429 |
24 | 1059648140522024304 |
[0,1,2,6,20,75,312,1421,7016,37260,211470,1275725, 8142840,54776761,387022118,2863489830,22127336720, 178162416499,1491567656472,12959459317021, 116654844101140,1086207322942812, 10447135955448522,103654461984288429, 1059648140522024304] |