n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 3 |
5 | 6 |
6 | 16 |
7 | 35 |
8 | 90 |
9 | 216 |
10 | 768 |
11 | 2310 |
12 | 7700 |
13 | 21450 |
14 | 69498 |
15 | 292864 |
16 | 1153152 |
17 | 4873050 |
18 | 16336320 |
19 | 64664600 |
20 | 249420600 |
21 | 1118939184 |
22 | 5462865408 |
23 | 28542158568 |
24 | 117487079424 |
25 | 547591590000 |
26 | 2474843571200 |
27 | 12760912164000 |
28 | 57424104738000 |
29 | 295284192952320 |
[1,1,2,3,6,16,35,90,216,768,2310,7700,21450,69498, 292864,1153152,4873050,16336320,64664600, 249420600,1118939184,5462865408,28542158568, 117487079424,547591590000,2474843571200, 12760912164000,57424104738000,295284192952320] |