n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 40 |
4 | 712 |
5 | 18784 |
6 | 663424 |
7 | 29480896 |
8 | 1581976960 |
9 | 99585422848 |
10 | 7198258087936 |
11 | 587699970912256 |
12 | 53497834761985024 |
13 | 5372784803063664640 |
14 | 590164397145095421952 |
15 | 70386834555048578596864 |
16 | 9058611906733586004803584 |
17 | 1251310862246447324484468736 |
18 | 184665445630564847038730076160 |
[1,1,4,40,712,18784,663424,29480896,1581976960, 99585422848,7198258087936,587699970912256, 53497834761985024,5372784803063664640, 590164397145095421952,70386834555048578596864, 9058611906733586004803584, 1251310862246447324484468736, 184665445630564847038730076160] |