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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 7 |
| 5 | 16 |
| 6 | 128 |
| 7 | 955 |
| 8 | 13467 |
| 9 | 253373 |
| 10 | 6466074 |
| 11 | 205749149 |
| 12 | 7943313377 |
| 13 | 363853255012 |
| 14 | 19485170158346 |
| 15 | 1205488841884007 |
| 16 | 85308028236495340 |
| 17 | 6846462326434510551 |
| 18 | 618498122199399056707 |
| 19 | 62478078728492272712838 |
| 20 | 7015617595855429187696753 |
[0,1,1,7,16,128,955,13467,253373,6466074, 205749149,7943313377,363853255012,19485170158346, 1205488841884007,85308028236495340, 6846462326434510551,618498122199399056707, 62478078728492272712838,7015617595855429187696753] |