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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 17 |
| 3 | 192 |
| 4 | 2620 |
| 5 | 50419 |
| 6 | 886940 |
| 7 | 16262433 |
| 8 | 297460457 |
| 9 | 5454615441 |
| 10 | 100139692226 |
| 11 | 1838775832727 |
| 12 | 33772164353187 |
| 13 | 620318895436140 |
| 14 | 11394299377600700 |
| 15 | 209299046583691084 |
| 16 | 3844588068009489220 |
| 17 | 70620996673429500824 |
[0,17,192,2620,50419,886940,16262433,297460457, 5454615441,100139692226,1838775832727, 33772164353187,620318895436140,11394299377600700, 209299046583691084,3844588068009489220, 70620996673429500824] |