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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 9 |
| 3 | 126 |
| 4 | 802 |
| 5 | 3158 |
| 6 | 10040 |
| 7 | 25464 |
| 8 | 58837 |
| 9 | 123422 |
| 10 | 238203 |
| 11 | 429467 |
| 12 | 733923 |
| 13 | 1200319 |
| 14 | 1912928 |
| 15 | 2945116 |
| 16 | 4369570 |
| 17 | 6338678 |
| 18 | 9053512 |
| 19 | 12622814 |
| 20 | 17359779 |
| 21 | 23503546 |
| 22 | 31347788 |
| 23 | 41161317 |
[0,9,126,802,3158,10040,25464,58837,123422,238203, 429467,733923,1200319,1912928,2945116,4369570, 6338678,9053512,12622814,17359779,23503546, 31347788,41161317] |