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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 36 |
| 5 | 137 |
| 6 | 553 |
| 7 | 2285 |
| 8 | 9693 |
| 9 | 41855 |
| 10 | 183561 |
| 11 | 814876 |
| 12 | 3654604 |
| 13 | 16535384 |
| 14 | 75366335 |
| 15 | 345737195 |
| 16 | 1594970323 |
| 17 | 7394406989 |
| 18 | 34431368556 |
| 19 | 160953486204 |
| 20 | 755038939596 |
| 21 | 3553119378943 |
| 22 | 16768513088521 |
| 23 | 79343597203618 |
| 24 | 376326378568765 |
| 25 | 1788822334786162 |
| 26 | 8520094632728376 |
| 27 | 40656455487711977 |
[1,1,3,10,36,137,553,2285,9693,41855,183561, 814876,3654604,16535384,75366335,345737195, 1594970323,7394406989,34431368556,160953486204, 755038939596,3553119378943,16768513088521, 79343597203618,376326378568765,1788822334786162, 8520094632728376,40656455487711977] |