| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 28 |
| 3 | 75 |
| 4 | 310 |
| 5 | 1468 |
| 6 | 5883 |
| 7 | 25093 |
| 8 | 108869 |
| 9 | 463940 |
| 10 | 1986171 |
| 11 | 8536518 |
| 12 | 36607272 |
| 13 | 157097926 |
| 14 | 674669588 |
| 15 | 2896563138 |
| 16 | 12438785892 |
| 17 | 53424623277 |
| 18 | 229451570948 |
| 19 | 985550702393 |
| 20 | 4233369125303 |
| 21 | 18184230957117 |
| 22 | 78112038108544 |
[8,28,75,310,1468,5883,25093,108869,463940, 1986171,8536518,36607272,157097926,674669588, 2896563138,12438785892,53424623277,229451570948, 985550702393,4233369125303,18184230957117, 78112038108544] |