n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 45 |
3 | 165 |
4 | 495 |
5 | 1287 |
6 | 3003 |
7 | 6435 |
8 | 12870 |
9 | 24309 |
10 | 43740 |
11 | 75411 |
12 | 124830 |
13 | 197505 |
14 | 293436 |
15 | 389367 |
16 | 389367 |
17 | 0 |
18 | -1562274 |
19 | -6216183 |
20 | -18365697 |
21 | -47600136 |
22 | -113879520 |
23 | -257123889 |
24 | -554298228 |
25 | -1148646906 |
26 | -2297293812 |
27 | -4443424371 |
28 | -8313049440 |
29 | -15011769204 |
[1,9,45,165,495,1287,3003,6435,12870,24309,43740, 75411,124830,197505,293436,389367,389367,0, -1562274,-6216183,-18365697,-47600136,-113879520, -257123889,-554298228,-1148646906,-2297293812, -4443424371,-8313049440,-15011769204] |