n | a(n) |
---|---|
2 | 1 |
3 | 4 |
4 | 14 |
5 | 51 |
6 | 202 |
7 | 876 |
8 | 4139 |
9 | 21146 |
10 | 115974 |
11 | 678569 |
12 | 4213596 |
13 | 27644436 |
14 | 190899321 |
15 | 1382958544 |
16 | 10480142146 |
17 | 82864869803 |
18 | 682076806158 |
19 | 5832742205056 |
20 | 51724158235371 |
21 | 474869816156750 |
22 | 4506715738447322 |
23 | 44152005855084345 |
[1,4,14,51,202,876,4139,21146,115974,678569, 4213596,27644436,190899321,1382958544,10480142146, 82864869803,682076806158,5832742205056, 51724158235371,474869816156750,4506715738447322, 44152005855084345] |