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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | 32 |
| 4 | 544 |
| 5 | 15872 |
| 6 | 707584 |
| 7 | 44736512 |
| 8 | 3807514624 |
| 9 | 419730685952 |
| 10 | 58177770225664 |
| 11 | 9902996106248192 |
| 12 | 2030847773013704704 |
| 13 | 493842960380415967232 |
| 14 | 140503203207887919775744 |
| 15 | 46238368375619195682947072 |
| 16 | 17427925514250338592341622784 |
| 17 | 7458815407441059142195019251712 |
[0,2,4,32,544,15872,707584,44736512,3807514624, 419730685952,58177770225664,9902996106248192, 2030847773013704704,493842960380415967232, 140503203207887919775744, 46238368375619195682947072, 17427925514250338592341622784, 7458815407441059142195019251712] |