n | a(n) |
---|---|
4 | 1 |
5 | 0 |
6 | 15 |
7 | 70 |
8 | 630 |
9 | 5544 |
10 | 55650 |
11 | 611820 |
12 | 7342335 |
13 | 95449640 |
14 | 1336295961 |
15 | 20044438050 |
16 | 320711010620 |
17 | 5452087178160 |
18 | 98137569209940 |
19 | 1864613814984984 |
20 | 37292276299704525 |
21 | 783137802293789040 |
22 | 17229031650463366195 |
23 | 396267727960657413630 |
[1,0,15,70,630,5544,55650,611820,7342335,95449640, 1336295961,20044438050,320711010620,5452087178160, 98137569209940,1864613814984984,37292276299704525, 783137802293789040,17229031650463366195, 396267727960657413630] |