n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 27 |
3 | 224 |
4 | 1500 |
5 | 8910 |
6 | 49049 |
7 | 256256 |
8 | 1288872 |
9 | 6298500 |
10 | 30093910 |
11 | 141210432 |
12 | 652860520 |
13 | 2981331990 |
14 | 13472983125 |
15 | 60343756800 |
16 | 268187306640 |
17 | 1183875281820 |
18 | 5194996380090 |
19 | 22676052360000 |
20 | 98513956031400 |
21 | 426171522716940 |
22 | 1836562780483002 |
[0,2,27,224,1500,8910,49049,256256,1288872, 6298500,30093910,141210432,652860520,2981331990, 13472983125,60343756800,268187306640, 1183875281820,5194996380090,22676052360000, 98513956031400,426171522716940,1836562780483002] |