n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 71 |
4 | 238 |
5 | 770 |
6 | 2436 |
7 | 7590 |
8 | 23397 |
9 | 71566 |
10 | 217646 |
11 | 659022 |
12 | 1988805 |
13 | 5986176 |
14 | 17980968 |
15 | 53922096 |
16 | 161492571 |
17 | 483149385 |
18 | 1444245936 |
19 | 4314214443 |
20 | 12880107548 |
21 | 38436170366 |
22 | 114657076900 |
23 | 341926185770 |
24 | 1019435748435 |
25 | 3038815305981 |
26 | 9056974493700 |
[1,5,20,71,238,770,2436,7590,23397,71566,217646, 659022,1988805,5986176,17980968,53922096, 161492571,483149385,1444245936,4314214443, 12880107548,38436170366,114657076900,341926185770, 1019435748435,3038815305981,9056974493700] |