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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 405 |
| 3 | 4031 |
| 4 | 31030 |
| 5 | 196882 |
| 6 | 1071637 |
| 7 | 5142716 |
| 8 | 22195440 |
| 9 | 87455155 |
| 10 | 318311627 |
| 11 | 1080299532 |
| 12 | 3445025535 |
| 13 | 10388772051 |
| 14 | 29784426945 |
| 15 | 81555340856 |
| 16 | 214122343813 |
| 17 | 540880490745 |
| 18 | 1318464472031 |
| 19 | 3109618390150 |
| 20 | 7112648815656 |
| 21 | 15810488782208 |
[1,28,405,4031,31030,196882,1071637,5142716, 22195440,87455155,318311627,1080299532,3445025535, 10388772051,29784426945,81555340856,214122343813, 540880490745,1318464472031,3109618390150, 7112648815656,15810488782208] |