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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 137 |
| 3 | 2710 |
| 4 | 65453 |
| 5 | 1516877 |
| 6 | 35691850 |
| 7 | 840634931 |
| 8 | 19825968683 |
| 9 | 467700681922 |
| 10 | 11033979463946 |
| 11 | 260310036348836 |
| 12 | 6141004253501805 |
| 13 | 144870026550523656 |
| 14 | 3417517033348984137 |
| 15 | 80619091513823917355 |
| 16 | 1901786313951533118427 |
[2,137,2710,65453,1516877,35691850,840634931, 19825968683,467700681922,11033979463946, 260310036348836,6141004253501805, 144870026550523656,3417517033348984137, 80619091513823917355,1901786313951533118427] |