n | a(n) |
---|---|
0 | 1 |
1 | -2 |
2 | -1 |
3 | -2 |
4 | -5 |
5 | -14 |
6 | -42 |
7 | -132 |
8 | -429 |
9 | -1430 |
10 | -4862 |
11 | -16796 |
12 | -58786 |
13 | -208012 |
14 | -742900 |
15 | -2674440 |
16 | -9694845 |
17 | -35357670 |
18 | -129644790 |
19 | -477638700 |
20 | -1767263190 |
21 | -6564120420 |
22 | -24466267020 |
23 | -91482563640 |
24 | -343059613650 |
25 | -1289904147324 |
26 | -4861946401452 |
27 | -18367353072152 |
[1,-2,-1,-2,-5,-14,-42,-132,-429,-1430,-4862, -16796,-58786,-208012,-742900,-2674440,-9694845, -35357670,-129644790,-477638700,-1767263190, -6564120420,-24466267020,-91482563640, -343059613650,-1289904147324,-4861946401452, -18367353072152] |