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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 51 |
| 4 | 109 |
| 5 | 415 |
| 6 | 863 |
| 7 | 13379 |
| 8 | 27473 |
| 9 | 107461 |
| 10 | 219121 |
| 11 | 1723575 |
| 12 | 3499153 |
| 13 | 13810887 |
| 14 | 27956079 |
| 15 | 884899683 |
| 16 | 1787478201 |
| 17 | 7085090409 |
| 18 | 14289590493 |
| 19 | 113433092349 |
| 20 | 228507214803 |
| 21 | 907912292457 |
| 22 | 1827259905369 |
[1,3,7,51,109,415,863,13379,27473,107461,219121, 1723575,3499153,13810887,27956079,884899683, 1787478201,7085090409,14289590493,113433092349, 228507214803,907912292457,1827259905369] |