n | a(n) |
---|---|
0 | 1 |
1 | -6 |
2 | 21 |
3 | -56 |
4 | 126 |
5 | -252 |
6 | 463 |
7 | -804 |
8 | 1365 |
9 | -2366 |
10 | 4368 |
11 | -8736 |
12 | 18565 |
13 | -40410 |
14 | 87381 |
15 | -184604 |
16 | 379050 |
17 | -758100 |
18 | 1486675 |
19 | -2884776 |
20 | 5592405 |
21 | -10919090 |
22 | 21572460 |
23 | -43144920 |
24 | 87087001 |
25 | -176565486 |
26 | 357913941 |
27 | -723002336 |
[1,-6,21,-56,126,-252,463,-804,1365,-2366,4368, -8736,18565,-40410,87381,-184604,379050,-758100, 1486675,-2884776,5592405,-10919090,21572460, -43144920,87087001,-176565486,357913941, -723002336] |