n | a(n) |
---|---|
3 | 0 |
4 | 2 |
5 | 6 |
6 | 20 |
7 | 66 |
8 | 210 |
9 | 652 |
10 | 1988 |
11 | 5982 |
12 | 17830 |
13 | 52782 |
14 | 155480 |
15 | 456364 |
16 | 1336066 |
17 | 3904280 |
18 | 11394244 |
19 | 33222902 |
20 | 96812174 |
21 | 282009512 |
22 | 821327088 |
23 | 2391918708 |
24 | 6966267782 |
25 | 20291422370 |
26 | 59116724728 |
27 | 172271893036 |
28 | 502157965938 |
[0,2,6,20,66,210,652,1988,5982,17830,52782,155480, 456364,1336066,3904280,11394244,33222902,96812174, 282009512,821327088,2391918708,6966267782, 20291422370,59116724728,172271893036,502157965938] |