n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 9 |
6 | 22 |
7 | 54 |
8 | 135 |
9 | 368 |
10 | 1060 |
11 | 3135 |
12 | 9295 |
13 | 27472 |
14 | 81309 |
15 | 242255 |
16 | 728429 |
17 | 2208483 |
18 | 6736523 |
19 | 20634196 |
20 | 63410076 |
21 | 195467757 |
22 | 604457802 |
23 | 1875053982 |
24 | 5833449236 |
25 | 18195767301 |
26 | 56888745654 |
27 | 178238369769 |
28 | 559538565187 |
29 | 1759796017533 |
30 | 5544359742297 |
[1,0,0,1,3,9,22,54,135,368,1060,3135,9295,27472, 81309,242255,728429,2208483,6736523,20634196, 63410076,195467757,604457802,1875053982, 5833449236,18195767301,56888745654,178238369769, 559538565187,1759796017533,5544359742297] |