n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 298 |
4 | 4240 |
5 | 75394 |
6 | 1608688 |
7 | 40045618 |
8 | 1139279680 |
9 | 36463487554 |
10 | 1296712045648 |
11 | 50724943433938 |
12 | 2164652356532320 |
13 | 100072984472662114 |
14 | 4982304066392196208 |
15 | 265770533884409878258 |
16 | 15122101633293034668160 |
17 | 914210942121577873619074 |
18 | 58519992421072004957876368 |
19 | 3954059527570115477197922578 |
[1,4,28,298,4240,75394,1608688,40045618, 1139279680,36463487554,1296712045648, 50724943433938,2164652356532320, 100072984472662114,4982304066392196208, 265770533884409878258,15122101633293034668160, 914210942121577873619074, 58519992421072004957876368, 3954059527570115477197922578] |