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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 30 |
| 3 | 179 |
| 4 | 1463 |
| 5 | 11104 |
| 6 | 99177 |
| 7 | 873440 |
| 8 | 8495091 |
| 9 | 83411515 |
| 10 | 875891198 |
| 11 | 9369874178 |
| 12 | 105309532739 |
| 13 | 1209529820548 |
| 14 | 14440652379524 |
| 15 | 176281552206096 |
| 16 | 2221616619449536 |
| 17 | 28610926728444102 |
| 18 | 378616619059602201 |
[1,4,30,179,1463,11104,99177,873440,8495091, 83411515,875891198,9369874178,105309532739, 1209529820548,14440652379524,176281552206096, 2221616619449536,28610926728444102, 378616619059602201] |