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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 12 |
| 3 | 145 |
| 4 | 420 |
| 5 | 4901 |
| 6 | 14280 |
| 7 | 166465 |
| 8 | 485112 |
| 9 | 5654885 |
| 10 | 16479540 |
| 11 | 192099601 |
| 12 | 559819260 |
| 13 | 6525731525 |
| 14 | 19017375312 |
| 15 | 221682772225 |
| 16 | 646030941360 |
| 17 | 7530688524101 |
| 18 | 21946034630940 |
| 19 | 255821727047185 |
| 20 | 745519146510612 |
| 21 | 8690408031080165 |
[5,12,145,420,4901,14280,166465,485112,5654885, 16479540,192099601,559819260,6525731525, 19017375312,221682772225,646030941360, 7530688524101,21946034630940,255821727047185, 745519146510612,8690408031080165] |