n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 15 |
4 | 28 |
5 | 90 |
6 | 281 |
7 | 737 |
8 | 2095 |
9 | 6268 |
10 | 17965 |
11 | 51360 |
12 | 149540 |
13 | 433577 |
14 | 1250789 |
15 | 3620541 |
16 | 10489538 |
17 | 30345263 |
18 | 87801224 |
19 | 254176114 |
20 | 735652561 |
21 | 2128923525 |
22 | 6161699035 |
23 | 17833776016 |
24 | 51613806741 |
25 | 149380609556 |
26 | 432342904636 |
[1,6,15,28,90,281,737,2095,6268,17965,51360, 149540,433577,1250789,3620541,10489538,30345263, 87801224,254176114,735652561,2128923525, 6161699035,17833776016,51613806741,149380609556, 432342904636] |