n | a(n) |
---|---|
1 | 0 |
2 | 6 |
3 | 23 |
4 | 76 |
5 | 239 |
6 | 723 |
7 | 2134 |
8 | 6199 |
9 | 17805 |
10 | 50718 |
11 | 143572 |
12 | 404431 |
13 | 1134768 |
14 | 3173742 |
15 | 8852664 |
16 | 24637530 |
17 | 68436135 |
18 | 189781721 |
19 | 525530245 |
20 | 1453425034 |
21 | 4015164095 |
22 | 11081117799 |
23 | 30554774842 |
24 | 84183856048 |
25 | 231774829750 |
26 | 637705962869 |
[0,6,23,76,239,723,2134,6199,17805,50718,143572, 404431,1134768,3173742,8852664,24637530,68436135, 189781721,525530245,1453425034,4015164095, 11081117799,30554774842,84183856048,231774829750, 637705962869] |