n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 70 |
4 | 210 |
5 | 462 |
6 | 6006 |
7 | 4290 |
8 | 72930 |
9 | 461890 |
10 | 1939938 |
11 | 4056234 |
12 | 6760390 |
13 | 1560090 |
14 | 6463230 |
15 | 200360130 |
16 | 2203961430 |
17 | 907513530 |
18 | 33578000610 |
19 | 22974421470 |
20 | 941951280270 |
[1,6,30,70,210,462,6006,4290,72930,461890,1939938, 4056234,6760390,1560090,6463230,200360130, 2203961430,907513530,33578000610,22974421470, 941951280270] |