n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 30 |
6 | 128 |
7 | 675 |
8 | 4231 |
9 | 30969 |
10 | 258689 |
11 | 2428956 |
12 | 25306287 |
13 | 289620751 |
14 | 3610490805 |
15 | 48686912930 |
16 | 706003798139 |
17 | 10953617995740 |
18 | 181035032207760 |
19 | 3175094503778521 |
20 | 58893601709552538 |
21 | 1151825702178908788 |
22 | 23688535118132456668 |
23 | 511050155316058710033 |
[0,0,1,3,9,30,128,675,4231,30969,258689,2428956, 25306287,289620751,3610490805,48686912930, 706003798139,10953617995740,181035032207760, 3175094503778521,58893601709552538, 1151825702178908788,23688535118132456668, 511050155316058710033] |