n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 5 |
6 | 20 |
7 | 84 |
8 | 316 |
9 | 1196 |
10 | 4461 |
11 | 16750 |
12 | 62878 |
13 | 237394 |
14 | 899265 |
15 | 3422111 |
16 | 13069026 |
17 | 50091095 |
18 | 192583152 |
19 | 742560511 |
20 | 2870523142 |
21 | 11122817672 |
22 | 43191285751 |
23 | 168046076423 |
24 | 654997492842 |
25 | 2557223459805 |
26 | 9999080270766 |
27 | 39152997087077 |
28 | 153511067364760 |
[0,0,0,1,5,20,84,316,1196,4461,16750,62878,237394, 899265,3422111,13069026,50091095,192583152, 742560511,2870523142,11122817672,43191285751, 168046076423,654997492842,2557223459805, 9999080270766,39152997087077,153511067364760] |