n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 60 |
5 | 262 |
6 | 1218 |
7 | 5798 |
8 | 28364 |
9 | 141239 |
10 | 714532 |
11 | 3660098 |
12 | 18949830 |
13 | 98997082 |
14 | 521218206 |
15 | 2762807736 |
16 | 14731968812 |
17 | 78968221213 |
18 | 425282844540 |
19 | 2299997984844 |
20 | 12485972925500 |
21 | 68015653648096 |
22 | 371666798915578 |
23 | 2036765196573550 |
24 | 11190993772943502 |
25 | 61637787236407747 |
[1,1,4,14,60,262,1218,5798,28364,141239,714532, 3660098,18949830,98997082,521218206,2762807736, 14731968812,78968221213,425282844540, 2299997984844,12485972925500,68015653648096, 371666798915578,2036765196573550, 11190993772943502,61637787236407747] |