n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 28 |
4 | 232 |
5 | 1984 |
6 | 16804 |
7 | 139012 |
8 | 1119172 |
9 | 8776036 |
10 | 67190308 |
11 | 503591332 |
12 | 3703703716 |
13 | 26779859332 |
14 | 190652265220 |
15 | 1337960522980 |
16 | 9264356481220 |
[1,4,28,232,1984,16804,139012,1119172,8776036, 67190308,503591332,3703703716,26779859332, 190652265220,1337960522980,9264356481220] |