n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 20 |
3 | 95 |
4 | 456 |
5 | 2184 |
6 | 10465 |
7 | 50140 |
8 | 240236 |
9 | 1151039 |
10 | 5514960 |
11 | 26423760 |
12 | 126603841 |
13 | 606595444 |
14 | 2906373380 |
15 | 13925271455 |
16 | 66719983896 |
17 | 319674648024 |
18 | 1531653256225 |
19 | 7338591633100 |
20 | 35161304909276 |
21 | 168467932913279 |
22 | 807178359657120 |
23 | 3867423865372320 |
[1,4,20,95,456,2184,10465,50140,240236,1151039, 5514960,26423760,126603841,606595444,2906373380, 13925271455,66719983896,319674648024, 1531653256225,7338591633100,35161304909276, 168467932913279,807178359657120,3867423865372320] |