n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 16 |
4 | 66 |
5 | 351 |
6 | 1758 |
7 | 9033 |
8 | 46159 |
9 | 236245 |
10 | 1208622 |
11 | 6183942 |
12 | 31638994 |
13 | 161877345 |
14 | 828222749 |
15 | 4237494527 |
16 | 21680576851 |
17 | 110925816281 |
18 | 567537279930 |
19 | 2903729582172 |
20 | 14856548980595 |
21 | 76011571374458 |
22 | 388903168793624 |
[0,3,16,66,351,1758,9033,46159,236245,1208622, 6183942,31638994,161877345,828222749,4237494527, 21680576851,110925816281,567537279930, 2903729582172,14856548980595,76011571374458, 388903168793624] |