n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 22 |
5 | 84 |
6 | 334 |
7 | 1368 |
8 | 5734 |
9 | 24480 |
10 | 106086 |
11 | 465462 |
12 | 2063658 |
13 | 9231084 |
14 | 41610162 |
15 | 188820726 |
16 | 861891478 |
17 | 3954732384 |
18 | 18230522422 |
19 | 84390187986 |
20 | 392120098258 |
21 | 1828220666844 |
22 | 8550445900442 |
23 | 40103716079436 |
[1,0,2,6,22,84,334,1368,5734,24480,106086,465462, 2063658,9231084,41610162,188820726,861891478, 3954732384,18230522422,84390187986,392120098258, 1828220666844,8550445900442,40103716079436] |