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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 22 |
| 5 | 1001 |
| 6 | 2882 |
| 7 | 15251 |
| 8 | 720027 |
| 9 | 7081807 |
| 10 | 7451547 |
| 11 | 26811862 |
| 12 | 54177145 |
| 13 | 1050660501 |
| 14 | 1085885801 |
| 15 | 1528888251 |
| 16 | 2911771192 |
| 17 | 2376574756732 |
| 18 | 5792526252975 |
| 19 | 5875432345785 |
| 20 | 10810300301801 |
| 21 | 264571020175462 |
| 22 | 5292834004382925 |
| 23 | 10808388588380801 |
| 24 | 15017579397571051 |
[0,1,5,22,1001,2882,15251,720027,7081807,7451547, 26811862,54177145,1050660501,1085885801, 1528888251,2911771192,2376574756732,5792526252975, 5875432345785,10810300301801,264571020175462, 5292834004382925,10808388588380801, 15017579397571051] |