n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 44 |
5 | 165 |
6 | 615 |
7 | 2296 |
8 | 8568 |
9 | 31977 |
10 | 119339 |
11 | 445380 |
12 | 1662180 |
13 | 6203341 |
14 | 23151183 |
15 | 86401392 |
16 | 322454384 |
17 | 1203416145 |
18 | 4491210195 |
19 | 16761424636 |
20 | 62554488348 |
21 | 233456528757 |
22 | 871271626679 |
23 | 3251629977960 |
24 | 12135248285160 |
25 | 45289363162681 |
26 | 169022204365563 |
27 | 630799454299572 |
[0,1,3,12,44,165,615,2296,8568,31977,119339, 445380,1662180,6203341,23151183,86401392, 322454384,1203416145,4491210195,16761424636, 62554488348,233456528757,871271626679, 3251629977960,12135248285160,45289363162681, 169022204365563,630799454299572] |