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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 23 |
| 3 | 227 |
| 4 | 2529 |
| 5 | 30275 |
| 6 | 380162 |
| 7 | 4939443 |
| 8 | 65844845 |
| 9 | 895451117 |
| 10 | 12374186318 |
| 11 | 173257703723 |
| 12 | 2452607696798 |
| 13 | 35042725663002 |
| 14 | 504697422982484 |
| 15 | 7319313029400467 |
| 16 | 106793147620036005 |
| 17 | 1566546633240722681 |
| 18 | 23089471526179716182 |
| 19 | 341774295456352388245 |
[1,3,23,227,2529,30275,380162,4939443,65844845, 895451117,12374186318,173257703723,2452607696798, 35042725663002,504697422982484,7319313029400467, 106793147620036005,1566546633240722681, 23089471526179716182,341774295456352388245] |