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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 36 |
| 3 | 505 |
| 4 | 1516 |
| 5 | 16677 |
| 6 | 216802 |
| 7 | 433605 |
| 8 | 7371286 |
| 9 | 140054435 |
| 10 | 140054436 |
| 11 | 3221252029 |
| 12 | 16106260146 |
| 13 | 48318780439 |
| 14 | 1401244632732 |
| 15 | 86877167229385 |
| 16 | 86877167229386 |
| 17 | 86877167229387 |
| 18 | 3214455187487320 |
| 19 | 3214455187487321 |
[1,7,36,505,1516,16677,216802,433605,7371286, 140054435,140054436,3221252029,16106260146, 48318780439,1401244632732,86877167229385, 86877167229386,86877167229387,3214455187487320, 3214455187487321] |