n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 7 |
5 | 18 |
6 | 59 |
7 | 221 |
8 | 936 |
9 | 4361 |
10 | 22083 |
11 | 120336 |
12 | 700653 |
13 | 4333933 |
14 | 28345090 |
15 | 195233255 |
16 | 1411303635 |
17 | 10675375402 |
18 | 84276173439 |
19 | 692752181561 |
20 | 5917018378496 |
21 | 52416910416933 |
22 | 480786834535247 |
23 | 4559132648864256 |
[1,1,2,3,7,18,59,221,936,4361,22083,120336,700653, 4333933,28345090,195233255,1411303635,10675375402, 84276173439,692752181561,5917018378496, 52416910416933,480786834535247,4559132648864256] |