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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 38 |
| 5 | 155 |
| 6 | 828 |
| 7 | 4390 |
| 8 | 25202 |
| 9 | 146803 |
| 10 | 878708 |
| 11 | 5330524 |
| 12 | 32785934 |
| 13 | 203687695 |
| 14 | 1276913732 |
| 15 | 8065359582 |
| 16 | 51282069040 |
[1,4,8,38,155,828,4390,25202,146803,878708, 5330524,32785934,203687695,1276913732,8065359582, 51282069040] |