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| n | a(n) |
|---|---|
| 9 | 1 |
| 10 | 1 |
| 11 | 3 |
| 12 | 8 |
| 13 | 22 |
| 14 | 60 |
| 15 | 167 |
| 16 | 465 |
| 17 | 1306 |
| 18 | 3680 |
| 19 | 10418 |
| 20 | 29582 |
| 21 | 84261 |
| 22 | 240581 |
| 23 | 688458 |
| 24 | 1973887 |
| 25 | 5669197 |
| 26 | 16307404 |
| 27 | 46973290 |
| 28 | 135474784 |
| 29 | 391164385 |
| 30 | 1130600056 |
| 31 | 3270921899 |
| 32 | 9471289877 |
| 33 | 27447106048 |
| 34 | 79598738454 |
| 35 | 231001452777 |
| 36 | 670812581033 |
| 37 | 1949157218646 |
| 38 | 5666759197092 |
[1,1,3,8,22,60,167,465,1306,3680,10418,29582, 84261,240581,688458,1973887,5669197,16307404, 46973290,135474784,391164385,1130600056, 3270921899,9471289877,27447106048,79598738454, 231001452777,670812581033,1949157218646, 5666759197092] |