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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 17 |
| 5 | 70 |
| 6 | 349 |
| 7 | 2017 |
| 8 | 9673 |
| 9 | 36321 |
| 10 | 138420 |
| 11 | 511748 |
| 12 | 1952716 |
| 13 | 7596839 |
| 14 | 30518737 |
| 15 | 122761971 |
| 16 | 492354214 |
| 17 | 1954807815 |
| 18 | 7749597167 |
| 19 | 30587342598 |
| 20 | 120939248751 |
| 21 | 478688493595 |
| 22 | 1897205025687 |
| 23 | 7520593309740 |
| 24 | 29825363773570 |
| 25 | 118218233684104 |
[1,2,5,17,70,349,2017,9673,36321,138420,511748, 1952716,7596839,30518737,122761971,492354214, 1954807815,7749597167,30587342598,120939248751, 478688493595,1897205025687,7520593309740, 29825363773570,118218233684104] |