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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 106 |
| 4 | 1120 |
| 5 | 11836 |
| 6 | 125080 |
| 7 | 1321816 |
| 8 | 13968640 |
| 9 | 147617296 |
| 10 | 1559984800 |
| 11 | 16485551776 |
| 12 | 174215426560 |
| 13 | 1841067576256 |
| 14 | 19455968321920 |
| 15 | 205606088676736 |
| 16 | 2172796696698880 |
| 17 | 22961603499049216 |
| 18 | 242652815170685440 |
| 19 | 2564297772701149696 |
| 20 | 27098894618035609600 |
[0,1,10,106,1120,11836,125080,1321816,13968640, 147617296,1559984800,16485551776,174215426560, 1841067576256,19455968321920,205606088676736, 2172796696698880,22961603499049216, 242652815170685440,2564297772701149696, 27098894618035609600] |