n | a(n) |
---|---|
1 | 2 |
2 | 5 |
3 | 20 |
4 | 65 |
5 | 230 |
6 | 785 |
7 | 2720 |
8 | 9365 |
9 | 32330 |
10 | 111485 |
11 | 384620 |
12 | 1326665 |
13 | 4576430 |
14 | 15786185 |
15 | 54454520 |
16 | 187839965 |
17 | 647952530 |
18 | 2235104885 |
19 | 7709972420 |
20 | 26595469265 |
21 | 91740800630 |
22 | 316458947585 |
23 | 1091621898320 |
24 | 3765538534565 |
25 | 12989186560730 |
26 | 44806065794285 |
[2,5,20,65,230,785,2720,9365,32330,111485,384620, 1326665,4576430,15786185,54454520,187839965, 647952530,2235104885,7709972420,26595469265, 91740800630,316458947585,1091621898320, 3765538534565,12989186560730,44806065794285] |