| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 28 |
| 3 | 185 |
| 4 | 1426 |
| 5 | 12607 |
| 6 | 125882 |
| 7 | 1401409 |
| 8 | 17209234 |
| 9 | 231033431 |
| 10 | 3365440882 |
| 11 | 52855452817 |
| 12 | 890097287834 |
| 13 | 15996379554079 |
| 14 | 305519496498106 |
| 15 | 6178746162639617 |
| 16 | 131885301216119842 |
| 17 | 2962568890205560999 |
| 18 | 69853182607494217154 |
| 19 | 1724761580035969997521 |
| 20 | 44501146220521229674282 |
[1,5,28,185,1426,12607,125882,1401409,17209234, 231033431,3365440882,52855452817,890097287834, 15996379554079,305519496498106,6178746162639617, 131885301216119842,2962568890205560999, 69853182607494217154,1724761580035969997521, 44501146220521229674282] |