n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 26 |
5 | 75 |
6 | 216 |
7 | 622 |
8 | 1791 |
9 | 5157 |
10 | 14849 |
11 | 42756 |
12 | 123111 |
13 | 354484 |
14 | 1020696 |
15 | 2938977 |
16 | 8462447 |
17 | 24366645 |
18 | 70160958 |
19 | 202020427 |
20 | 581694636 |
21 | 1674922950 |
22 | 4822748423 |
23 | 13886550633 |
24 | 39984728949 |
25 | 115131438424 |
26 | 331507764639 |
27 | 954538564968 |
28 | 2748484256480 |
[0,1,3,9,26,75,216,622,1791,5157,14849,42756, 123111,354484,1020696,2938977,8462447,24366645, 70160958,202020427,581694636,1674922950, 4822748423,13886550633,39984728949,115131438424, 331507764639,954538564968,2748484256480] |