n | a(n) |
---|---|
0 | 840 |
1 | 2040 |
2 | 4440 |
3 | 9240 |
4 | 25320 |
5 | 51000 |
6 | 117480 |
7 | 271320 |
8 | 765480 |
9 | 1531320 |
10 | 3721800 |
11 | 7817640 |
12 | 15635640 |
13 | 32899560 |
14 | 65799480 |
15 | 139098120 |
16 | 349027320 |
17 | 699333000 |
18 | 1597611000 |
19 | 3386944680 |
20 | 9543610200 |
21 | 20041583280 |
[840,2040,4440,9240,25320,51000,117480,271320, 765480,1531320,3721800,7817640,15635640,32899560, 65799480,139098120,349027320,699333000,1597611000, 3386944680,9543610200,20041583280] |