n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 19 |
6 | 70 |
7 | 261 |
8 | 914 |
9 | 3177 |
10 | 10816 |
11 | 36566 |
12 | 122552 |
13 | 408840 |
14 | 1358032 |
15 | 4497995 |
16 | 14862112 |
17 | 49019688 |
18 | 161449208 |
19 | 531152855 |
20 | 1745892452 |
21 | 5734722698 |
22 | 18826352472 |
23 | 61777432510 |
24 | 202648614072 |
25 | 664569581090 |
26 | 2178948104572 |
27 | 7143067052707 |
28 | 23413795288008 |
[0,0,0,1,4,19,70,261,914,3177,10816,36566,122552, 408840,1358032,4497995,14862112,49019688, 161449208,531152855,1745892452,5734722698, 18826352472,61777432510,202648614072,664569581090, 2178948104572,7143067052707,23413795288008] |