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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 48 |
| 6 | 2452 |
| 7 | 183958 |
| 8 | 4877756 |
| 9 | 17454844 |
| 10 | 20071150430 |
| 11 | 409158464142 |
| 12 | 129586764260850 |
| 13 | 269333638458151764 |
| 14 | 1868569007661198289216 |
| 15 | 326772188939088357313806 |
| 16 | 48024472200935599107697461965204 |
| 17 | 11653191042139941668276738496190656 |
[1,2,5,14,48,2452,183958,4877756,17454844, 20071150430,409158464142,129586764260850, 269333638458151764,1868569007661198289216, 326772188939088357313806, 48024472200935599107697461965204, 11653191042139941668276738496190656] |