n | a(n) |
---|---|
1 | 0 |
2 | -1 |
3 | -2 |
4 | -3 |
5 | -4 |
6 | -10 |
7 | -20 |
8 | -35 |
9 | -56 |
10 | -126 |
11 | -252 |
12 | -462 |
13 | -792 |
14 | -1716 |
15 | -3432 |
16 | -6435 |
17 | -11440 |
18 | -24310 |
19 | -48620 |
20 | -92378 |
21 | -167960 |
22 | -352716 |
23 | -705432 |
24 | -1352078 |
25 | -2496144 |
26 | -5200300 |
27 | -10400600 |
28 | -20058300 |
29 | -37442160 |
30 | -77558760 |
31 | -155117520 |
32 | -300540195 |
[0,-1,-2,-3,-4,-10,-20,-35,-56,-126,-252,-462, -792,-1716,-3432,-6435,-11440,-24310,-48620, -92378,-167960,-352716,-705432,-1352078,-2496144, -5200300,-10400600,-20058300,-37442160,-77558760, -155117520,-300540195] |