n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 4 |
3 | 24 |
4 | 436 |
5 | 3888 |
6 | 29880 |
7 | 264460 |
8 | 2353136 |
9 | 20400352 |
10 | 171215320 |
11 | 1430108512 |
12 | 11962161392 |
13 | 99523393628 |
14 | 822501750184 |
15 | 6763177931936 |
16 | 55433124540308 |
17 | 453013557727460 |
18 | 3690931980743340 |
19 | 29988435689294280 |
20 | 243064471330287696 |
21 | 1965884816120576180 |
[0,0,4,24,436,3888,29880,264460,2353136,20400352, 171215320,1430108512,11962161392,99523393628, 822501750184,6763177931936,55433124540308, 453013557727460,3690931980743340, 29988435689294280,243064471330287696, 1965884816120576180] |