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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 16 |
| 3 | 2220 |
| 4 | 374160 |
| 5 | 53511471 |
| 6 | 6188114528 |
| 7 | 527457882126 |
| 8 | 36521876237448 |
| 9 | 1952615455825446 |
| 10 | 86220169777616208 |
| 11 | 3212254985375294550 |
| 12 | 99345949328271872420 |
| 13 | 2632974948301168473984 |
| 14 | 61767819644161815082080 |
| 15 | 1284454579537478675292282 |
| 16 | 23584751451820642893522984 |
[1,1,16,2220,374160,53511471,6188114528, 527457882126,36521876237448,1952615455825446, 86220169777616208,3212254985375294550, 99345949328271872420,2632974948301168473984, 61767819644161815082080,1284454579537478675292282, 23584751451820642893522984] |