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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 59 |
| 4 | 1465 |
| 5 | 19047 |
| 6 | 194726 |
| 7 | 1734714 |
| 8 | 13506810 |
| 9 | 91496261 |
| 10 | 543067118 |
| 11 | 2862579656 |
| 12 | 13596395709 |
| 13 | 58966870090 |
| 14 | 236182156566 |
| 15 | 882025314222 |
| 16 | 3095734502639 |
| 17 | 10279759883927 |
| 18 | 32476397677376 |
| 19 | 98079088190039 |
| 20 | 284292946153409 |
[0,0,59,1465,19047,194726,1734714,13506810, 91496261,543067118,2862579656,13596395709, 58966870090,236182156566,882025314222, 3095734502639,10279759883927,32476397677376, 98079088190039,284292946153409] |