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A001623 as a simple table
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 46 |
| 6 | 1064 |
| 7 | 35792 |
| 8 | 1673792 |
| 9 | 103443808 |
| 10 | 8154999232 |
| 11 | 798030483328 |
| 12 | 94866122760704 |
| 13 | 13460459852344064 |
| 14 | 2246551018310998016 |
| 15 | 435626600453967929344 |
| 16 | 97108406689489312301056 |
| 17 | 24658059294992101453262848 |
| 18 | 7075100096781964808223653888 |
| 19 | 2277710095706779480096994066432 |
| 20 | 817555425148510266964075644059648 |
[1,4,46,1064,35792,1673792,103443808,8154999232, 798030483328,94866122760704,13460459852344064, 2246551018310998016,435626600453967929344, 97108406689489312301056, 24658059294992101453262848, 7075100096781964808223653888, 2277710095706779480096994066432, 817555425148510266964075644059648] |