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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 235 |
| 4 | 1470 |
| 5 | 8001 |
| 6 | 45865 |
| 7 | 241870 |
| 8 | 1307055 |
| 9 | 6783210 |
| 10 | 35510502 |
| 11 | 181665635 |
| 12 | 934801705 |
| 13 | 4741017595 |
| 14 | 24118500815 |
| 15 | 121693135003 |
| 16 | 614889556920 |
| 17 | 3091596201560 |
| 18 | 15557885702390 |
| 19 | 78054925105630 |
| 20 | 391798489621630 |
| 21 | 1963104427709830 |
| 22 | 9838685572501515 |
[1,5,40,235,1470,8001,45865,241870,1307055, 6783210,35510502,181665635,934801705,4741017595, 24118500815,121693135003,614889556920, 3091596201560,15557885702390,78054925105630, 391798489621630,1963104427709830,9838685572501515] |