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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 31 |
| 3 | 242 |
| 4 | 3093 |
| 5 | 32525 |
| 6 | 368168 |
| 7 | 4051333 |
| 8 | 45064131 |
| 9 | 499200274 |
| 10 | 5538624025 |
| 11 | 61414079849 |
| 12 | 681135796944 |
| 13 | 7553728681433 |
| 14 | 83772910243607 |
| 15 | 929052526388050 |
| 16 | 10303364319347757 |
| 17 | 114266002348885717 |
| 18 | 1267229634537217144 |
| 19 | 14053790947047408701 |
| 20 | 155858934437282250075 |
[0,1,31,242,3093,32525,368168,4051333,45064131, 499200274,5538624025,61414079849,681135796944, 7553728681433,83772910243607,929052526388050, 10303364319347757,114266002348885717, 1267229634537217144,14053790947047408701, 155858934437282250075] |