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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 21 |
| 3 | 71 |
| 4 | 196 |
| 5 | 2071 |
| 6 | 2071 |
| 7 | 33321 |
| 8 | 345821 |
| 9 | 736446 |
| 10 | 8548946 |
| 11 | 18314571 |
| 12 | 18314571 |
| 13 | 994877071 |
| 14 | 994877071 |
| 15 | 25408939571 |
| 16 | 86444095821 |
| 17 | 239031986446 |
| 18 | 1001971439571 |
| 19 | 16260760502071 |
| 20 | 92554705814571 |
| 21 | 283289569095821 |
| 22 | 1236963885502071 |
| 23 | 8389521258548946 |
[0,1,21,71,196,2071,2071,33321,345821,736446, 8548946,18314571,18314571,994877071,994877071, 25408939571,86444095821,239031986446, 1001971439571,16260760502071,92554705814571, 283289569095821,1236963885502071,8389521258548946] |