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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 1933 |
| 3 | 3820 |
| 4 | 14888 |
| 5 | 62544 |
| 6 | 291784 |
| 7 | 1277500 |
| 8 | 5758443 |
| 9 | 26328879 |
| 10 | 118276552 |
| 11 | 531491667 |
| 12 | 2406395782 |
| 13 | 10892034473 |
| 14 | 49246533056 |
| 15 | 222848686116 |
| 16 | 1008667256385 |
| 17 | 4564536675139 |
| 18 | 20660407068626 |
| 19 | 93538032416560 |
| 20 | 423503341613182 |
[8,1933,3820,14888,62544,291784,1277500,5758443, 26328879,118276552,531491667,2406395782, 10892034473,49246533056,222848686116, 1008667256385,4564536675139,20660407068626, 93538032416560,423503341613182] |