n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 4 |
8 | 13 |
9 | 45 |
10 | 143 |
11 | 461 |
12 | 1470 |
13 | 4747 |
14 | 15364 |
15 | 50283 |
16 | 165549 |
17 | 549734 |
18 | 1837539 |
19 | 6184589 |
20 | 20938983 |
21 | 71297174 |
22 | 244009225 |
23 | 839101403 |
24 | 2898145437 |
25 | 10050549437 |
26 | 34985611467 |
27 | 122209803101 |
28 | 428285696895 |
29 | 1505491979826 |
[1,1,0,0,0,0,1,4,13,45,143,461,1470,4747,15364, 50283,165549,549734,1837539,6184589,20938983, 71297174,244009225,839101403,2898145437, 10050549437,34985611467,122209803101,428285696895, 1505491979826] |