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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 146 |
| 3 | 260 |
| 4 | 1820 |
| 5 | 3752 |
| 6 | 24818 |
| 7 | 56612 |
| 8 | 355364 |
| 9 | 872600 |
| 10 | 5238356 |
| 11 | 13605608 |
| 12 | 78675128 |
| 13 | 213600848 |
| 14 | 1196862482 |
| 15 | 3368311460 |
| 16 | 18375903380 |
| 17 | 53276769080 |
| 18 | 284073991196 |
| 19 | 844510526840 |
| 20 | 4414662677384 |
| 21 | 13408173196592 |
| 22 | 68889810592532 |
[20,146,260,1820,3752,24818,56612,355364,872600, 5238356,13605608,78675128,213600848,1196862482, 3368311460,18375903380,53276769080,284073991196, 844510526840,4414662677384,13408173196592, 68889810592532] |