n | a(n) |
---|---|
1 | 1 |
2 | 15 |
3 | 111 |
4 | 561 |
5 | 2211 |
6 | 7293 |
7 | 21021 |
8 | 54483 |
9 | 129558 |
10 | 286858 |
11 | 598026 |
12 | 1184118 |
13 | 2242266 |
14 | 4083366 |
15 | 7184166 |
16 | 12257850 |
17 | 20348031 |
18 | 32951985 |
19 | 52179985 |
20 | 80958735 |
21 | 123288165 |
22 | 184562235 |
23 | 271965915 |
24 | 394962165 |
25 | 565884540 |
26 | 800652996 |
27 | 1119632580 |
28 | 1548656956 |
[1,15,111,561,2211,7293,21021,54483,129558,286858, 598026,1184118,2242266,4083366,7184166,12257850, 20348031,32951985,52179985,80958735,123288165, 184562235,271965915,394962165,565884540,800652996, 1119632580,1548656956] |