n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 4 |
3 | 1 |
4 | 60 |
5 | 393 |
6 | 4498 |
7 | 54689 |
8 | 773384 |
9 | 12268369 |
10 | 216328614 |
11 | 4195769433 |
12 | 88776964444 |
13 | 2034936319817 |
14 | 50232646818890 |
15 | 1328570248040497 |
16 | 37481046375146640 |
17 | 1123486426007081505 |
18 | 35657224567565828302 |
19 | 1194561018775753556777 |
20 | 42125545306641497600036 |
[1,-1,4,1,60,393,4498,54689,773384,12268369, 216328614,4195769433,88776964444,2034936319817, 50232646818890,1328570248040497,37481046375146640, 1123486426007081505,35657224567565828302, 1194561018775753556777,42125545306641497600036] |