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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 31 |
| 5 | 164 |
| 6 | 1021 |
| 7 | 7340 |
| 8 | 59899 |
| 9 | 547423 |
| 10 | 5541311 |
| 11 | 61560751 |
| 12 | 744810564 |
| 13 | 9749580487 |
| 14 | 137299957892 |
| 15 | 2069988277027 |
| 16 | 33266800950301 |
| 17 | 567742165061876 |
| 18 | 10254686071781119 |
| 19 | 195439907769223706 |
| 20 | 3919618523321600065 |
| 21 | 82517650453354285621 |
| 22 | 1819502802723019762607 |
[1,2,7,31,164,1021,7340,59899,547423,5541311, 61560751,744810564,9749580487,137299957892, 2069988277027,33266800950301,567742165061876, 10254686071781119,195439907769223706, 3919618523321600065,82517650453354285621, 1819502802723019762607] |