n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 105 |
5 | 284 |
6 | 747 |
7 | 984 |
8 | 2230 |
9 | 5377 |
10 | 11513 |
11 | 15453 |
12 | 56611 |
13 | 140810 |
14 | 1282328 |
15 | 2175211 |
16 | 3328834 |
17 | 96073801 |
18 | 285626436 |
19 | 801855023 |
20 | 927833490 |
[0,1,2,6,105,284,747,984,2230,5377,11513,15453, 56611,140810,1282328,2175211,3328834,96073801, 285626436,801855023,927833490] |