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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 12 |
| 5 | 130 |
| 6 | 284 |
| 7 | 1557 |
| 8 | 5838 |
| 9 | 24821 |
| 10 | 106561 |
| 11 | 449606 |
| 12 | 1956599 |
| 13 | 8438660 |
| 14 | 36764273 |
| 15 | 160295868 |
| 16 | 700439879 |
| 17 | 3066084680 |
| 18 | 13431404246 |
| 19 | 58893058333 |
| 20 | 258348784769 |
| 21 | 1133779588694 |
| 22 | 4977030114598 |
| 23 | 21852290559017 |
| 24 | 95959325703386 |
[1,2,10,12,130,284,1557,5838,24821,106561,449606, 1956599,8438660,36764273,160295868,700439879, 3066084680,13431404246,58893058333,258348784769, 1133779588694,4977030114598,21852290559017, 95959325703386] |