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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 54 |
| 3 | 128 |
| 4 | 396 |
| 5 | 1440 |
| 6 | 5676 |
| 7 | 22844 |
| 8 | 93968 |
| 9 | 389820 |
| 10 | 1626348 |
| 11 | 6799728 |
| 12 | 28470780 |
| 13 | 119289068 |
| 14 | 500005184 |
| 15 | 2096208716 |
| 16 | 8789088828 |
| 17 | 36853587936 |
| 18 | 154536271820 |
| 19 | 648021215772 |
| 20 | 2717393443696 |
| 21 | 11395105468828 |
| 22 | 47784338066636 |
[5,54,128,396,1440,5676,22844,93968,389820, 1626348,6799728,28470780,119289068,500005184, 2096208716,8789088828,36853587936,154536271820, 648021215772,2717393443696,11395105468828, 47784338066636] |