n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 60 |
6 | 184 |
7 | 560 |
8 | 1695 |
9 | 5200 |
10 | 15956 |
11 | 48916 |
12 | 149664 |
13 | 458048 |
14 | 1402360 |
15 | 4294417 |
16 | 13149210 |
17 | 40259178 |
18 | 123260854 |
19 | 377395940 |
20 | 1155508592 |
21 | 3537919648 |
22 | 10832298239 |
23 | 33165996032 |
24 | 101546731816 |
25 | 310913195800 |
26 | 951945967120 |
27 | 2914642812096 |
28 | 8923975209168 |
[0,1,2,6,18,60,184,560,1695,5200,15956,48916, 149664,458048,1402360,4294417,13149210,40259178, 123260854,377395940,1155508592,3537919648, 10832298239,33165996032,101546731816,310913195800, 951945967120,2914642812096,8923975209168] |