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n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 37 |
4 | 241 |
5 | 1801 |
6 | 15121 |
7 | 141121 |
8 | 1451521 |
9 | 16329601 |
10 | 199584001 |
11 | 2634508801 |
12 | 37362124801 |
13 | 566658892801 |
14 | 9153720576001 |
15 | 156920924160001 |
16 | 2845499424768001 |
17 | 54420176498688001 |
18 | 1094805903679488001 |
19 | 23112569077678080001 |
20 | 510909421717094400001 |
21 | 11802007641664880640001 |
[1,2,7,37,241,1801,15121,141121,1451521,16329601, 199584001,2634508801,37362124801,566658892801, 9153720576001,156920924160001,2845499424768001, 54420176498688001,1094805903679488001, 23112569077678080001,510909421717094400001, 11802007641664880640001] |