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| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 784 |
| 3 | 896 |
| 4 | 3024 |
| 5 | 9912 |
| 6 | 33488 |
| 7 | 111328 |
| 8 | 374416 |
| 9 | 1249472 |
| 10 | 4192384 |
| 11 | 14013664 |
| 12 | 46966976 |
| 13 | 157118976 |
| 14 | 526293824 |
| 15 | 1761299456 |
| 16 | 5898133248 |
| 17 | 19742507904 |
| 18 | 66103688448 |
| 19 | 221286062592 |
| 20 | 740881883392 |
| 21 | 2480260385792 |
| 22 | 8303825768448 |
[28,784,896,3024,9912,33488,111328,374416,1249472, 4192384,14013664,46966976,157118976,526293824, 1761299456,5898133248,19742507904,66103688448, 221286062592,740881883392,2480260385792, 8303825768448] |