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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 29 |
| 5 | 100 |
| 6 | 317 |
| 7 | 1007 |
| 8 | 3146 |
| 9 | 10016 |
| 10 | 31712 |
| 11 | 100204 |
| 12 | 316799 |
| 13 | 1002314 |
| 14 | 3169309 |
| 15 | 10022310 |
| 16 | 31693094 |
[1,4,9,29,100,317,1007,3146,10016,31712,100204, 316799,1002314,3169309,10022310,31693094] |