n | a(n) |
---|---|
0 | -1 |
1 | -2 |
2 | -2 |
3 | 10 |
4 | 94 |
5 | 538 |
6 | 2638 |
7 | 12010 |
8 | 52414 |
9 | 222778 |
10 | 930478 |
11 | 3840010 |
12 | 15714334 |
13 | 63920218 |
14 | 258869518 |
15 | 1045044010 |
16 | 4208873854 |
17 | 16921588858 |
18 | 67944635758 |
19 | 272553384010 |
20 | 1092538058974 |
21 | 4377125804698 |
22 | 17529423925198 |
23 | 70180457820010 |
24 | 280910117637694 |
25 | 1124205329623738 |
26 | 4498515895713838 |
[-1,-2,-2,10,94,538,2638,12010,52414,222778, 930478,3840010,15714334,63920218,258869518, 1045044010,4208873854,16921588858,67944635758, 272553384010,1092538058974,4377125804698, 17529423925198,70180457820010,280910117637694, 1124205329623738,4498515895713838] |