n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 73 |
6 | 240 |
7 | 748 |
8 | 2240 |
9 | 6525 |
10 | 18653 |
11 | 52640 |
12 | 147210 |
13 | 408957 |
14 | 1130398 |
15 | 3112172 |
16 | 8540753 |
17 | 23375439 |
18 | 63830072 |
19 | 173949534 |
20 | 473211976 |
21 | 1285299971 |
22 | 3486071977 |
23 | 9442928926 |
24 | 25548319586 |
25 | 69046732343 |
26 | 186416183910 |
27 | 502821645418 |
28 | 1355067144205 |
29 | 3648781579445 |
30 | 9817397466928 |
[1,1,2,6,21,73,240,748,2240,6525,18653,52640, 147210,408957,1130398,3112172,8540753,23375439, 63830072,173949534,473211976,1285299971, 3486071977,9442928926,25548319586,69046732343, 186416183910,502821645418,1355067144205, 3648781579445,9817397466928] |