n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 22 |
4 | 160 |
5 | 1464 |
6 | 16224 |
7 | 211632 |
8 | 3179520 |
9 | 54092160 |
10 | 1028113920 |
11 | 21594021120 |
12 | 496702402560 |
13 | 12418039065600 |
14 | 335293281792000 |
15 | 9723592350259200 |
16 | 301432670532403200 |
17 | 9947299050359193600 |
18 | 348155822449999872000 |
19 | 12881771833023700992000 |
20 | 502389223133024747520000 |
[0,1,4,22,160,1464,16224,211632,3179520,54092160, 1028113920,21594021120,496702402560, 12418039065600,335293281792000,9723592350259200, 301432670532403200,9947299050359193600, 348155822449999872000,12881771833023700992000, 502389223133024747520000] |