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| n | a(n) |
|---|---|
| 10 | 1 |
| 11 | 1 |
| 12 | 3 |
| 13 | 8 |
| 14 | 22 |
| 15 | 60 |
| 16 | 167 |
| 17 | 465 |
| 18 | 1306 |
| 19 | 3681 |
| 20 | 10421 |
| 21 | 29593 |
| 22 | 84298 |
| 23 | 240705 |
| 24 | 688859 |
| 25 | 1975176 |
| 26 | 5673279 |
| 27 | 16320250 |
| 28 | 47013406 |
| 29 | 135599456 |
| 30 | 391550002 |
| 31 | 1131788538 |
| 32 | 3274572887 |
| 33 | 9482475518 |
| 34 | 27481293566 |
| 35 | 79703012121 |
| 36 | 231318904534 |
| 37 | 671777453618 |
| 38 | 1952085567096 |
| 39 | 5675634863875 |
[1,1,3,8,22,60,167,465,1306,3681,10421,29593, 84298,240705,688859,1975176,5673279,16320250, 47013406,135599456,391550002,1131788538, 3274572887,9482475518,27481293566,79703012121, 231318904534,671777453618,1952085567096, 5675634863875] |