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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 34 |
| 5 | 170 |
| 6 | 1024 |
| 7 | 7173 |
| 8 | 57385 |
| 9 | 516468 |
| 10 | 5164680 |
| 11 | 56811482 |
| 12 | 681737791 |
| 13 | 8862591291 |
| 14 | 124076278077 |
| 15 | 1861144171155 |
| 16 | 29778306738485 |
| 17 | 506231214554248 |
| 18 | 9112161861976473 |
| 19 | 173131075377552995 |
| 20 | 3462621507551059902 |
[1,2,8,34,170,1024,7173,57385,516468,5164680, 56811482,681737791,8862591291,124076278077, 1861144171155,29778306738485,506231214554248, 9112161861976473,173131075377552995, 3462621507551059902] |