n | a(n) |
---|---|
0 | -1 |
1 | 0 |
2 | 15 |
3 | 80 |
4 | 231 |
5 | 504 |
6 | 935 |
7 | 1560 |
8 | 2415 |
9 | 3536 |
10 | 4959 |
11 | 6720 |
12 | 8855 |
13 | 11400 |
14 | 14391 |
15 | 17864 |
16 | 21855 |
17 | 26400 |
18 | 31535 |
19 | 37296 |
20 | 43719 |
21 | 50840 |
22 | 58695 |
23 | 67320 |
24 | 76751 |
25 | 87024 |
26 | 98175 |
27 | 110240 |
28 | 123255 |
29 | 137256 |
30 | 152279 |
31 | 168360 |
[-1,0,15,80,231,504,935,1560,2415,3536,4959,6720, 8855,11400,14391,17864,21855,26400,31535,37296, 43719,50840,58695,67320,76751,87024,98175,110240, 123255,137256,152279,168360] |