n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 21 |
3 | 66 |
4 | 201 |
5 | 606 |
6 | 1821 |
7 | 5466 |
8 | 16401 |
9 | 49206 |
10 | 147621 |
11 | 442866 |
12 | 1328601 |
13 | 3985806 |
14 | 11957421 |
15 | 35872266 |
16 | 107616801 |
17 | 322850406 |
18 | 968551221 |
19 | 2905653666 |
20 | 8716961001 |
21 | 26150883006 |
22 | 78452649021 |
23 | 235357947066 |
24 | 706073841201 |
25 | 2118221523606 |
[1,6,21,66,201,606,1821,5466,16401,49206,147621, 442866,1328601,3985806,11957421,35872266, 107616801,322850406,968551221,2905653666, 8716961001,26150883006,78452649021,235357947066, 706073841201,2118221523606] |