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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 12 |
| 3 | 80 |
| 4 | 196 |
| 5 | 1638 |
| 6 | 4864 |
| 7 | 22425 |
| 8 | 46500 |
| 9 | 109779 |
| 10 | 158625 |
| 11 | 603564 |
| 12 | 2552416 |
| 13 | 2620142 |
| 14 | 2627250 |
| 15 | 41163747 |
| 16 | 237398795 |
| 17 | 1966466950 |
| 18 | 13690729828 |
| 19 | 64322158656 |
| 20 | 79838739611 |
| 21 | 220355987735 |
| 22 | 232268774850 |
| 23 | 618745972214 |
| 24 | 1882062476406 |
| 25 | 9607713772982 |
| 26 | 19364051829855 |
| 27 | 26393150937218 |
| 28 | 37636607806688 |
| 29 | 84128837898780 |
| 30 | 85992223800358 |
[2,12,80,196,1638,4864,22425,46500,109779,158625, 603564,2552416,2620142,2627250,41163747,237398795, 1966466950,13690729828,64322158656,79838739611, 220355987735,232268774850,618745972214, 1882062476406,9607713772982,19364051829855, 26393150937218,37636607806688,84128837898780, 85992223800358] |