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| n | a(n) |
|---|---|
| 0 | 52 |
| 1 | 120 |
| 2 | 299 |
| 3 | 801 |
| 4 | 2295 |
| 5 | 6995 |
| 6 | 40043 |
| 7 | 243235 |
| 8 | 1562071 |
| 9 | 10569612 |
| 10 | 75114998 |
| 11 | 559057663 |
| 12 | 4346341361 |
| 13 | 35213909313 |
| 14 | 296696424975 |
| 15 | 2594712611306 |
| 16 | 23512150424424 |
| 17 | 220412149622759 |
| 18 | 2134476336680003 |
| 19 | 21324751529837231 |
| 20 | 219524646452224135 |
| 21 | 2325946109640859828 |
[52,120,299,801,2295,6995,40043,243235,1562071, 10569612,75114998,559057663,4346341361, 35213909313,296696424975,2594712611306, 23512150424424,220412149622759,2134476336680003, 21324751529837231,219524646452224135, 2325946109640859828] |