n | a(n) |
---|---|
0 | 1 |
1 | 15 |
2 | 135 |
3 | 870 |
4 | 3992 |
5 | 14142 |
6 | 41400 |
7 | 104870 |
8 | 237288 |
9 | 490654 |
10 | 942888 |
11 | 1705510 |
12 | 2932344 |
13 | 4829246 |
14 | 7664856 |
15 | 11782374 |
16 | 17612360 |
17 | 25686558 |
18 | 36652744 |
19 | 51290598 |
20 | 70528600 |
21 | 95461950 |
22 | 127371512 |
23 | 167743782 |
24 | 218291880 |
25 | 280977566 |
26 | 358034280 |
27 | 451991206 |
28 | 565698360 |
[1,15,135,870,3992,14142,41400,104870,237288, 490654,942888,1705510,2932344,4829246,7664856, 11782374,17612360,25686558,36652744,51290598, 70528600,95461950,127371512,167743782,218291880, 280977566,358034280,451991206,565698360] |