n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 8 |
4 | 15 |
5 | 71 |
6 | 176 |
7 | 673 |
8 | 1905 |
9 | 6616 |
10 | 19951 |
11 | 66263 |
12 | 205920 |
13 | 669761 |
14 | 2111201 |
15 | 6799528 |
16 | 21577935 |
17 | 69174631 |
18 | 220220176 |
19 | 704442593 |
20 | 2245983825 |
21 | 7177081976 |
22 | 22898968751 |
23 | 73138542583 |
24 | 233431323840 |
25 | 745401121921 |
26 | 2379420388801 |
[0,1,1,8,15,71,176,673,1905,6616,19951,66263, 205920,669761,2111201,6799528,21577935,69174631, 220220176,704442593,2245983825,7177081976, 22898968751,73138542583,233431323840,745401121921, 2379420388801] |