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| n | a(n) |
|---|---|
| 8 | 2 |
| 9 | 13 |
| 10 | 101 |
| 11 | 619 |
| 12 | 3641 |
| 13 | 20028 |
| 14 | 106812 |
| 15 | 554352 |
| 16 | 2828660 |
| 17 | 14244878 |
| 18 | 71077246 |
| 19 | 352184306 |
| 20 | 1736118578 |
| 21 | 8525182798 |
| 22 | 41741378126 |
| 23 | 203929434766 |
| 24 | 994680883360 |
| 25 | 4845761306611 |
| 26 | 23586192274443 |
| 27 | 114731539477465 |
| 28 | 557859497501007 |
| 29 | 2711772157178038 |
| 30 | 13180227306740726 |
[2,13,101,619,3641,20028,106812,554352,2828660, 14244878,71077246,352184306,1736118578,8525182798, 41741378126,203929434766,994680883360, 4845761306611,23586192274443,114731539477465, 557859497501007,2711772157178038, 13180227306740726] |