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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 17 |
| 6 | 112 |
| 7 | 160 |
| 8 | 1182 |
| 9 | 3526 |
| 10 | 27550 |
| 11 | 60332 |
| 12 | 863283 |
| 13 | 1636608 |
| 14 | 19121869 |
| 15 | 84580104 |
| 16 | 501914374 |
| 17 | 1492170608 |
| 18 | 23751681540 |
| 19 | 47340359590 |
| 20 | 637742792823 |
| 21 | 2546703019081 |
| 22 | 18317620779149 |
| 23 | 49923584451714 |
[1,1,3,9,17,112,160,1182,3526,27550,60332,863283, 1636608,19121869,84580104,501914374,1492170608, 23751681540,47340359590,637742792823, 2546703019081,18317620779149,49923584451714] |