n | a(n) |
---|---|
1 | 6 |
2 | 90 |
3 | 810 |
4 | 5508 |
5 | 31590 |
6 | 161838 |
7 | 765450 |
8 | 3411720 |
9 | 14526054 |
10 | 59639490 |
11 | 237731274 |
12 | 924707340 |
13 | 3523453830 |
14 | 13191428502 |
15 | 48642794730 |
16 | 177008116752 |
17 | 636661003590 |
18 | 2266409860650 |
19 | 7994034370026 |
20 | 27964010896020 |
21 | 97092998430246 |
[6,90,810,5508,31590,161838,765450,3411720, 14526054,59639490,237731274,924707340,3523453830, 13191428502,48642794730,177008116752,636661003590, 2266409860650,7994034370026,27964010896020, 97092998430246] |