n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 26 |
5 | 75 |
6 | 216 |
7 | 623 |
8 | 1800 |
9 | 5211 |
10 | 15115 |
11 | 43923 |
12 | 127854 |
13 | 372749 |
14 | 1088283 |
15 | 3181545 |
16 | 9312312 |
17 | 27287091 |
18 | 80038449 |
19 | 234988827 |
20 | 690513030 |
21 | 2030695569 |
22 | 5976418602 |
23 | 17601021837 |
24 | 51869858544 |
25 | 152951628725 |
26 | 451271872701 |
27 | 1332147482253 |
[0,1,3,9,26,75,216,623,1800,5211,15115,43923, 127854,372749,1088283,3181545,9312312,27287091, 80038449,234988827,690513030,2030695569, 5976418602,17601021837,51869858544,152951628725, 451271872701,1332147482253] |