n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 12 |
5 | 30 |
6 | 90 |
7 | 210 |
8 | 560 |
9 | 1680 |
10 | 4200 |
11 | 11550 |
12 | 34650 |
13 | 90090 |
14 | 252252 |
15 | 756756 |
16 | 2018016 |
17 | 5717712 |
18 | 17153136 |
19 | 46558512 |
20 | 133024320 |
21 | 399072960 |
22 | 1097450640 |
23 | 3155170590 |
24 | 9465511770 |
25 | 26293088250 |
26 | 75957810500 |
27 | 227873431500 |
28 | 638045608200 |
29 | 1850332263780 |
30 | 5550996791340 |
[1,1,2,6,12,30,90,210,560,1680,4200,11550,34650, 90090,252252,756756,2018016,5717712,17153136, 46558512,133024320,399072960,1097450640, 3155170590,9465511770,26293088250,75957810500, 227873431500,638045608200,1850332263780, 5550996791340] |