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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 130 |
| 3 | 121 |
| 4 | 734 |
| 5 | 3919 |
| 6 | 18032 |
| 7 | 88551 |
| 8 | 451972 |
| 9 | 2321249 |
| 10 | 12137569 |
| 11 | 63355517 |
| 12 | 331023922 |
| 13 | 1728150269 |
| 14 | 9030802400 |
| 15 | 47208375405 |
| 16 | 246881037203 |
| 17 | 1291394949698 |
| 18 | 6756128612030 |
| 19 | 35346832154347 |
| 20 | 184937519180936 |
| 21 | 967629683194543 |
[1,130,121,734,3919,18032,88551,451972,2321249, 12137569,63355517,331023922,1728150269,9030802400, 47208375405,246881037203,1291394949698, 6756128612030,35346832154347,184937519180936, 967629683194543] |