| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 9 |
| 8 | 10 |
| 9 | 15 |
| 10 | 16 |
| 11 | 11 |
| 12 | 12 |
| 13 | 25 |
| 14 | 50 |
| 15 | 147 |
| 16 | 220 |
| 17 | 6125 |
| 18 | 1968750 |
| 19 | 89142864525 |
| 20 | 84252896510182189218 |
| 21 | 34892570216750728458698250328871491829901861750593684043 |
[0,1,2,3,4,5,6,9,10,15,16,11,12,25,50,147,220, 6125,1968750,89142864525,84252896510182189218, 34892570216750728458698250328871491829901861750593\ 684043] |