n | a(n) |
---|---|
0 | 1 |
1 | 18 |
2 | 150 |
3 | 980 |
4 | 5670 |
5 | 30492 |
6 | 156156 |
7 | 772200 |
8 | 3719430 |
9 | 17551820 |
10 | 81477396 |
11 | 373173528 |
12 | 1690097500 |
13 | 7582037400 |
14 | 33738060600 |
15 | 149067936720 |
16 | 654576544710 |
17 | 2858667619500 |
18 | 12423860225700 |
19 | 53760146239800 |
20 | 231720014946420 |
21 | 995238809839560 |
22 | 4260800401533000 |
[1,18,150,980,5670,30492,156156,772200,3719430, 17551820,81477396,373173528,1690097500,7582037400, 33738060600,149067936720,654576544710, 2858667619500,12423860225700,53760146239800, 231720014946420,995238809839560,4260800401533000] |