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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 25 |
| 4 | 281 |
| 5 | 2941 |
| 6 | 30596 |
| 7 | 315385 |
| 8 | 3231664 |
| 9 | 32972224 |
| 10 | 335346193 |
| 11 | 3402373313 |
| 12 | 34454358909 |
| 13 | 348373701706 |
| 14 | 3518101287286 |
| 15 | 35491654274101 |
[0,3,25,281,2941,30596,315385,3231664,32972224, 335346193,3402373313,34454358909,348373701706, 3518101287286,35491654274101] |