n | a(n) |
---|---|
1 | 2 |
2 | 1 |
3 | 3 |
4 | 6 |
5 | 12 |
6 | 24 |
7 | 66 |
8 | 168 |
9 | 408 |
10 | 1014 |
11 | 2820 |
12 | 7656 |
13 | 20370 |
14 | 54096 |
15 | 154416 |
16 | 430710 |
17 | 1182504 |
18 | 3258816 |
19 | 9377922 |
20 | 26651328 |
21 | 74941608 |
22 | 210709446 |
23 | 612566616 |
24 | 1760983512 |
25 | 5017273554 |
26 | 14308403856 |
27 | 41833393896 |
28 | 121321861350 |
29 | 349444725492 |
30 | 1006135834560 |
[2,1,3,6,12,24,66,168,408,1014,2820,7656,20370, 54096,154416,430710,1182504,3258816,9377922, 26651328,74941608,210709446,612566616,1760983512, 5017273554,14308403856,41833393896,121321861350, 349444725492,1006135834560] |