n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 15 |
4 | 21 |
5 | 135 |
6 | 177 |
7 | 1155 |
8 | 1509 |
9 | 9855 |
10 | 12873 |
11 | 84075 |
12 | 109821 |
13 | 717255 |
14 | 936897 |
15 | 6118995 |
16 | 7992789 |
17 | 52201935 |
18 | 68187513 |
19 | 445341435 |
20 | 581716461 |
21 | 3799265175 |
22 | 4962698097 |
23 | 32412020835 |
24 | 42337417029 |
25 | 276511126815 |
26 | 361185960873 |
[0,3,15,21,135,177,1155,1509,9855,12873,84075, 109821,717255,936897,6118995,7992789,52201935, 68187513,445341435,581716461,3799265175, 4962698097,32412020835,42337417029,276511126815, 361185960873] |