n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 20 |
4 | 76 |
5 | 285 |
6 | 1065 |
7 | 3976 |
8 | 14840 |
9 | 55385 |
10 | 206701 |
11 | 771420 |
12 | 2878980 |
13 | 10744501 |
14 | 40099025 |
15 | 149651600 |
16 | 558507376 |
17 | 2084377905 |
18 | 7779004245 |
19 | 29031639076 |
20 | 108347552060 |
21 | 404358569165 |
22 | 1509086724601 |
23 | 5631988329240 |
24 | 21018866592360 |
25 | 78443478040201 |
26 | 292755045568445 |
[0,1,5,20,76,285,1065,3976,14840,55385,206701, 771420,2878980,10744501,40099025,149651600, 558507376,2084377905,7779004245,29031639076, 108347552060,404358569165,1509086724601, 5631988329240,21018866592360,78443478040201, 292755045568445] |