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| n | a(n) |
|---|---|
| 1 | 1576 |
| 2 | 2884 |
| 3 | 6136 |
| 4 | 14644 |
| 5 | 38056 |
| 6 | 105604 |
| 7 | 309016 |
| 8 | 945364 |
| 9 | 3004936 |
| 10 | 9877924 |
| 11 | 33458296 |
| 12 | 116413684 |
| 13 | 414874216 |
| 14 | 1510107844 |
| 15 | 5598165976 |
| 16 | 21077667604 |
| 17 | 80389277896 |
| 18 | 309840123364 |
| 19 | 1204303904056 |
| 20 | 4712234595124 |
| 21 | 18534372807976 |
[1576,2884,6136,14644,38056,105604,309016,945364, 3004936,9877924,33458296,116413684,414874216, 1510107844,5598165976,21077667604,80389277896, 309840123364,1204303904056,4712234595124, 18534372807976] |