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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 125 |
| 4 | 686 |
| 5 | 6655 |
| 6 | 15379 |
| 7 | 58956 |
| 8 | 102885 |
| 9 | 267674 |
| 10 | 853615 |
| 11 | 1191640 |
| 12 | 2887221 |
| 13 | 4824470 |
| 14 | 6122039 |
| 15 | 9551716 |
| 16 | 17418609 |
| 17 | 29779955 |
| 18 | 35182055 |
| 19 | 56242681 |
| 20 | 75161310 |
| 21 | 86361774 |
| 22 | 128190140 |
| 23 | 164102869 |
| 24 | 232639770 |
| 25 | 357767816 |
| 26 | 437877925 |
| 27 | 482985334 |
[1,9,125,686,6655,15379,58956,102885,267674, 853615,1191640,2887221,4824470,6122039,9551716, 17418609,29779955,35182055,56242681,75161310, 86361774,128190140,164102869,232639770,357767816, 437877925,482985334] |