n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 19 |
5 | 53 |
6 | 153 |
7 | 455 |
8 | 1359 |
9 | 4073 |
10 | 12213 |
11 | 36635 |
12 | 109899 |
13 | 329693 |
14 | 989073 |
15 | 2967215 |
16 | 8901639 |
17 | 26704913 |
18 | 80114733 |
19 | 240344195 |
20 | 721032579 |
21 | 2163097733 |
22 | 6489293193 |
23 | 19467879575 |
24 | 58403638719 |
25 | 175210916153 |
26 | 525632748453 |
27 | 1576898245355 |
28 | 4730694736059 |
[0,1,3,7,19,53,153,455,1359,4073,12213,36635, 109899,329693,989073,2967215,8901639,26704913, 80114733,240344195,721032579,2163097733, 6489293193,19467879575,58403638719,175210916153, 525632748453,1576898245355,4730694736059] |