n | a(n) |
---|---|
1 | 0 |
2 | 171 |
3 | 405 |
4 | 3249 |
5 | 12609 |
6 | 72225 |
7 | 332937 |
8 | 1731321 |
9 | 8410473 |
10 | 42400017 |
11 | 209335185 |
12 | 1045669905 |
13 | 5189897529 |
14 | 25851542121 |
15 | 128510546841 |
16 | 639547289793 |
17 | 3180802829697 |
18 | 15825291313473 |
19 | 78719710355433 |
20 | 391617249901785 |
[0,171,405,3249,12609,72225,332937,1731321, 8410473,42400017,209335185,1045669905,5189897529, 25851542121,128510546841,639547289793, 3180802829697,15825291313473,78719710355433, 391617249901785] |