n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 12 |
4 | 44 |
5 | 170 |
6 | 936 |
7 | 7308 |
8 | 98768 |
9 | 2472012 |
10 | 120051680 |
11 | 11208976504 |
12 | 1981094071104 |
13 | 656526407783376 |
14 | 406758179201296832 |
15 | 471397289547064631520 |
16 | 1024016251272440926318848 |
17 | 4180909690610059855623236192 |
18 | 32176399052621010609861807435264 |
[1,4,12,44,170,936,7308,98768,2472012,120051680, 11208976504,1981094071104,656526407783376, 406758179201296832,471397289547064631520, 1024016251272440926318848, 4180909690610059855623236192, 32176399052621010609861807435264] |