n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 15 |
4 | 55 |
5 | 200 |
6 | 728 |
7 | 2652 |
8 | 9690 |
9 | 35530 |
10 | 130750 |
11 | 482885 |
12 | 1789515 |
13 | 6653325 |
14 | 24812400 |
15 | 92798375 |
16 | 347993910 |
17 | 1308233790 |
18 | 4929576600 |
19 | 18615637950 |
20 | 70441574000 |
21 | 267058714626 |
22 | 1014283603024 |
23 | 3858687620200 |
24 | 14702930414900 |
[0,1,4,15,55,200,728,2652,9690,35530,130750, 482885,1789515,6653325,24812400,92798375, 347993910,1308233790,4929576600,18615637950, 70441574000,267058714626,1014283603024, 3858687620200,14702930414900] |