n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 42 |
6 | 84 |
7 | 156 |
8 | 312 |
9 | 684 |
10 | 1020 |
11 | 1380 |
12 | 1860 |
13 | 3480 |
14 | 3720 |
15 | 4920 |
16 | 7320 |
17 | 10980 |
18 | 14640 |
19 | 16920 |
20 | 21960 |
21 | 26280 |
22 | 34920 |
23 | 45720 |
24 | 59640 |
25 | 69840 |
26 | 89880 |
27 | 106680 |
28 | 125160 |
29 | 145320 |
30 | 177240 |
31 | 213360 |
32 | 244440 |
33 | 269640 |
34 | 354480 |
35 | 320040 |
36 | 375480 |
37 | 435960 |
38 | 456120 |
39 | 531720 |
40 | 647640 |
[1,2,6,20,42,84,156,312,684,1020,1380,1860,3480, 3720,4920,7320,10980,14640,16920,21960,26280, 34920,45720,59640,69840,89880,106680,125160, 145320,177240,213360,244440,269640,354480,320040, 375480,435960,456120,531720,647640] |