n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 70 |
4 | 225 |
5 | 681 |
6 | 1970 |
7 | 5500 |
8 | 14920 |
9 | 39520 |
10 | 102592 |
11 | 261760 |
12 | 657920 |
13 | 1632000 |
14 | 4001280 |
15 | 9708544 |
16 | 23336960 |
17 | 55623680 |
18 | 131563520 |
19 | 309002240 |
20 | 721092608 |
21 | 1672806400 |
22 | 3859415040 |
23 | 8859156480 |
24 | 20240138240 |
25 | 46038777856 |
26 | 104291368960 |
27 | 235342397440 |
28 | 529153392640 |
[1,5,20,70,225,681,1970,5500,14920,39520,102592, 261760,657920,1632000,4001280,9708544,23336960, 55623680,131563520,309002240,721092608,1672806400, 3859415040,8859156480,20240138240,46038777856, 104291368960,235342397440,529153392640] |