n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 20 |
3 | 166 |
4 | 1812 |
5 | 22504 |
6 | 297362 |
7 | 4067298 |
8 | 56897300 |
9 | 809019580 |
10 | 11649254520 |
11 | 169444978124 |
12 | 2485270719570 |
13 | 36707044807996 |
14 | 545386321069862 |
15 | 8144809732228666 |
16 | 122177690210103060 |
17 | 1839933274439787940 |
18 | 27804610626798500372 |
19 | 421476329345312885304 |
20 | 6406685025104178888312 |
[2,4,20,166,1812,22504,297362,4067298,56897300, 809019580,11649254520,169444978124,2485270719570, 36707044807996,545386321069862,8144809732228666, 122177690210103060,1839933274439787940, 27804610626798500372,421476329345312885304, 6406685025104178888312] |