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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 39 |
| 4 | 271 |
| 5 | 1986 |
| 6 | 15171 |
| 7 | 119694 |
| 8 | 968589 |
| 9 | 7997970 |
| 10 | 67132164 |
| 11 | 571138362 |
| 12 | 4914229293 |
| 13 | 42690269053 |
| 14 | 373915274505 |
| 15 | 3298492524831 |
| 16 | 29279961769422 |
| 17 | 261348675838758 |
| 18 | 2344226713167048 |
| 19 | 21119556517672650 |
| 20 | 191022983002755162 |
| 21 | 1733959471178342088 |
| 22 | 15790787266617518790 |
[1,1,6,39,271,1986,15171,119694,968589,7997970, 67132164,571138362,4914229293,42690269053, 373915274505,3298492524831,29279961769422, 261348675838758,2344226713167048, 21119556517672650,191022983002755162, 1733959471178342088,15790787266617518790] |