n | a(n) |
---|---|
4 | 1 |
5 | 3 |
6 | 9 |
7 | 28 |
8 | 65 |
9 | 201 |
10 | 430 |
11 | 1316 |
12 | 2721 |
13 | 8259 |
14 | 16793 |
15 | 50680 |
16 | 102102 |
17 | 306958 |
18 | 615024 |
19 | 1844304 |
20 | 3682545 |
21 | 11024331 |
22 | 21963161 |
23 | 65675764 |
24 | 130648089 |
25 | 390374193 |
26 | 775797750 |
27 | 2316881892 |
28 | 4601346295 |
29 | 13737041045 |
30 | 27270124455 |
[1,3,9,28,65,201,430,1316,2721,8259,16793,50680, 102102,306958,615024,1844304,3682545,11024331, 21963161,65675764,130648089,390374193,775797750, 2316881892,4601346295,13737041045,27270124455] |