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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 33 |
| 4 | 195 |
| 5 | 1292 |
| 6 | 9177 |
| 7 | 68310 |
| 8 | 525915 |
| 9 | 4153380 |
| 10 | 33460284 |
| 11 | 273904969 |
| 12 | 2271800037 |
| 13 | 19050406788 |
| 14 | 161242554550 |
| 15 | 1375709203260 |
| 16 | 11819200090635 |
| 17 | 102162535941492 |
| 18 | 887830494976788 |
| 19 | 7752586858050900 |
| 20 | 67986848888695660 |
| 21 | 598522586288243760 |
| 22 | 5287559893638230385 |
[3,7,33,195,1292,9177,68310,525915,4153380, 33460284,273904969,2271800037,19050406788, 161242554550,1375709203260,11819200090635, 102162535941492,887830494976788,7752586858050900, 67986848888695660,598522586288243760, 5287559893638230385] |