n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 30 |
4 | 126 |
5 | 534 |
6 | 2262 |
7 | 9534 |
8 | 40254 |
9 | 169302 |
10 | 702510 |
11 | 2929806 |
12 | 12222414 |
13 | 50908158 |
14 | 212134902 |
15 | 882794118 |
16 | 3654001326 |
17 | 15159263934 |
18 | 62906444238 |
19 | 260853828438 |
20 | 1081924309806 |
21 | 4484440327350 |
[1,6,30,126,534,2262,9534,40254,169302,702510, 2929806,12222414,50908158,212134902,882794118, 3654001326,15159263934,62906444238,260853828438, 1081924309806,4484440327350] |