n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 6 |
6 | 25 |
7 | 91 |
8 | 442 |
9 | 2241 |
10 | 12591 |
11 | 75180 |
12 | 478648 |
13 | 3211245 |
14 | 22635956 |
15 | 166828221 |
16 | 1281518573 |
17 | 10229858290 |
18 | 84652925554 |
19 | 724601312400 |
20 | 6403522811765 |
21 | 58327076550161 |
22 | 546764617643250 |
23 | 5267719312771122 |
24 | 52096218005705959 |
25 | 528285485054771639 |
[1,0,1,1,3,6,25,91,442,2241,12591,75180,478648, 3211245,22635956,166828221,1281518573,10229858290, 84652925554,724601312400,6403522811765, 58327076550161,546764617643250,5267719312771122, 52096218005705959,528285485054771639] |