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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 103 |
| 6 | 488 |
| 7 | 2320 |
| 8 | 10867 |
| 9 | 49971 |
| 10 | 225861 |
| 11 | 1005821 |
| 12 | 4423807 |
| 13 | 19255967 |
| 14 | 83093364 |
| 15 | 355956164 |
| 16 | 1515437339 |
| 17 | 6417727259 |
| 18 | 27054820649 |
| 19 | 113602953089 |
| 20 | 475370846639 |
| 21 | 1983142721039 |
| 22 | 8250982614809 |
| 23 | 34246497698633 |
| 24 | 141838788939623 |
| 25 | 586322071478503 |
| 26 | 2419474311617803 |
| 27 | 9968270142800955 |
| 28 | 41010408788528703 |
| 29 | 168499207575017087 |
[1,1,2,6,23,103,488,2320,10867,49971,225861, 1005821,4423807,19255967,83093364,355956164, 1515437339,6417727259,27054820649,113602953089, 475370846639,1983142721039,8250982614809, 34246497698633,141838788939623,586322071478503, 2419474311617803,9968270142800955, 41010408788528703,168499207575017087] |