n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 15 |
3 | 45 |
4 | 107 |
5 | 265 |
6 | 615 |
7 | 1485 |
8 | 3227 |
9 | 7225 |
10 | 15735 |
11 | 35325 |
12 | 75019 |
13 | 163145 |
14 | 348135 |
15 | 761805 |
16 | 1589147 |
17 | 3374905 |
18 | 7077495 |
19 | 15138045 |
20 | 31390219 |
21 | 66122825 |
22 | 137816295 |
23 | 292344525 |
24 | 601532059 |
25 | 1253593145 |
26 | 2591401335 |
27 | 5435447805 |
28 | 11157226763 |
[1,5,15,45,107,265,615,1485,3227,7225,15735,35325, 75019,163145,348135,761805,1589147,3374905, 7077495,15138045,31390219,66122825,137816295, 292344525,601532059,1253593145,2591401335, 5435447805,11157226763] |