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| n | a(n) |
|---|---|
| 1 | 784 |
| 2 | 2116 |
| 3 | 6724 |
| 4 | 20449 |
| 5 | 53824 |
| 6 | 145924 |
| 7 | 451584 |
| 8 | 1368900 |
| 9 | 3724900 |
| 10 | 10240000 |
| 11 | 30603024 |
| 12 | 90897156 |
| 13 | 253892356 |
| 14 | 710862244 |
| 15 | 2085383556 |
| 16 | 6110861584 |
| 17 | 17291198016 |
| 18 | 48919707684 |
| 19 | 142124476036 |
| 20 | 413163557284 |
| 21 | 1177385585476 |
| 22 | 3351857932864 |
[784,2116,6724,20449,53824,145924,451584,1368900, 3724900,10240000,30603024,90897156,253892356, 710862244,2085383556,6110861584,17291198016, 48919707684,142124476036,413163557284, 1177385585476,3351857932864] |