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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 88 |
| 2 | 2376 |
| 3 | 34320 |
| 4 | 330330 |
| 5 | 2378376 |
| 6 | 13741728 |
| 7 | 66745536 |
| 8 | 281582730 |
| 9 | 1056804320 |
| 10 | 3593134688 |
| 11 | 11224833984 |
| 12 | 32583198648 |
| 13 | 88687996320 |
| 14 | 228054847680 |
| 15 | 557467405440 |
| 16 | 1302209017395 |
| 17 | 2919831983640 |
| 18 | 6308278977000 |
| 19 | 13175740578000 |
| 20 | 26680874670450 |
| 21 | 52514737446600 |
[1,88,2376,34320,330330,2378376,13741728,66745536, 281582730,1056804320,3593134688,11224833984, 32583198648,88687996320,228054847680,557467405440, 1302209017395,2919831983640,6308278977000, 13175740578000,26680874670450,52514737446600] |