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A271599 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 20 |
| 3 | 65 |
| 4 | 225 |
| 5 | 796 |
| 6 | 3220 |
| 7 | 11880 |
| 8 | 47172 |
| 9 | 188004 |
| 10 | 747464 |
| 11 | 2982848 |
| 12 | 11909008 |
| 13 | 47634836 |
| 14 | 190514480 |
| 15 | 761884472 |
[1,5,20,65,225,796,3220,11880,47172,188004,747464, 2982848,11909008,47634836,190514480,761884472] |