| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 36 |
| 3 | 168 |
| 4 | 755 |
| 5 | 3346 |
| 6 | 14747 |
| 7 | 64848 |
| 8 | 284892 |
| 9 | 1251103 |
| 10 | 5493314 |
| 11 | 24118255 |
| 12 | 105887532 |
| 13 | 464877504 |
| 14 | 2040939083 |
| 15 | 8960260498 |
| 16 | 39337870403 |
| 17 | 172703402424 |
| 18 | 758212386132 |
| 19 | 3328747303735 |
| 20 | 14614056052994 |
| 21 | 64159460722903 |
| 22 | 281676515111412 |
| 23 | 1236632261449368 |
| 24 | 5429133302704547 |
[1,7,36,168,755,3346,14747,64848,284892,1251103, 5493314,24118255,105887532,464877504,2040939083, 8960260498,39337870403,172703402424,758212386132, 3328747303735,14614056052994,64159460722903, 281676515111412,1236632261449368,5429133302704547] |