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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 40 |
| 4 | 317 |
| 5 | 3166 |
| 6 | 37987 |
| 7 | 531812 |
| 8 | 8508985 |
| 9 | 153161722 |
| 10 | 3063234431 |
| 11 | 67391157472 |
| 12 | 1617387779317 |
| 13 | 42052082262230 |
| 14 | 1177458303342427 |
| 15 | 35323749100272796 |
| 16 | 1130359971208729457 |
| 17 | 38432239021096801522 |
| 18 | 1383560604759484854775 |
| 19 | 52575302980860424481432 |
[1,2,7,40,317,3166,37987,531812,8508985,153161722, 3063234431,67391157472,1617387779317, 42052082262230,1177458303342427,35323749100272796, 1130359971208729457,38432239021096801522, 1383560604759484854775,52575302980860424481432] |