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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 25 |
| 3 | 120 |
| 4 | 565 |
| 5 | 2615 |
| 6 | 11950 |
| 7 | 54045 |
| 8 | 242365 |
| 9 | 1079240 |
| 10 | 4777225 |
| 11 | 21038595 |
| 12 | 92244790 |
| 13 | 402898865 |
| 14 | 1753806625 |
| 15 | 7611458520 |
| 16 | 32945585965 |
| 17 | 142262759615 |
| 18 | 612991045150 |
| 19 | 2636186279445 |
| 20 | 11317111447765 |
| 21 | 48506655275240 |
| 22 | 207603081203425 |
[5,25,120,565,2615,11950,54045,242365,1079240, 4777225,21038595,92244790,402898865,1753806625, 7611458520,32945585965,142262759615,612991045150, 2636186279445,11317111447765,48506655275240, 207603081203425] |