n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 54 |
6 | 227 |
7 | 1019 |
8 | 4762 |
9 | 23012 |
10 | 114487 |
11 | 583893 |
12 | 3044598 |
13 | 16197880 |
14 | 87798933 |
15 | 484377698 |
16 | 2718044549 |
17 | 15507602279 |
18 | 89947655628 |
19 | 530420332747 |
20 | 3180793948207 |
21 | 19404122501300 |
22 | 120475202020535 |
23 | 761689102469013 |
24 | 4906578443997601 |
25 | 32221210135485056 |
26 | 215818333117100371 |
[1,1,1,4,13,54,227,1019,4762,23012,114487,583893, 3044598,16197880,87798933,484377698,2718044549, 15507602279,89947655628,530420332747, 3180793948207,19404122501300,120475202020535, 761689102469013,4906578443997601, 32221210135485056,215818333117100371] |