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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 39 |
| 4 | 150 |
| 5 | 852 |
| 6 | 5878 |
| 7 | 36508 |
| 8 | 257339 |
| 9 | 1897582 |
| 10 | 13546124 |
| 11 | 99062938 |
| 12 | 730631648 |
| 13 | 5352541480 |
| 14 | 39385482959 |
| 15 | 290323776295 |
| 16 | 2137176029793 |
| 17 | 15745384555599 |
| 18 | 116047495611888 |
| 19 | 855066620245327 |
| 20 | 6301299509638167 |
| 21 | 46440600081326500 |
[1,8,39,150,852,5878,36508,257339,1897582, 13546124,99062938,730631648,5352541480, 39385482959,290323776295,2137176029793, 15745384555599,116047495611888,855066620245327, 6301299509638167,46440600081326500] |