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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 32 |
| 3 | 336 |
| 4 | 4032 |
| 5 | 52336 |
| 6 | 715392 |
| 7 | 10144192 |
| 8 | 147836416 |
| 9 | 2200709040 |
| 10 | 33319564288 |
| 11 | 511496462656 |
| 12 | 7942988228608 |
| 13 | 124551530359360 |
| 14 | 1969386732874752 |
| 15 | 31364967043386112 |
| 16 | 502686338657607680 |
| 17 | 8101474649157519536 |
| 18 | 131212844750426749696 |
| 19 | 2134554132316280052288 |
| 20 | 34862936239396076532736 |
| 21 | 571454628433830080180288 |
| 22 | 9397626191659208856570880 |
| 23 | 155006334509119865698297600 |
| 24 | 2563700952357088703495372800 |
[1,4,32,336,4032,52336,715392,10144192,147836416, 2200709040,33319564288,511496462656,7942988228608, 124551530359360,1969386732874752, 31364967043386112,502686338657607680, 8101474649157519536,131212844750426749696, 2134554132316280052288,34862936239396076532736, 571454628433830080180288, 9397626191659208856570880, 155006334509119865698297600, 2563700952357088703495372800] |