n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 0 |
5 | 8 |
6 | 8 |
7 | 71 |
8 | 212 |
9 | 731 |
10 | 1840 |
11 | 5953 |
12 | 18632 |
13 | 54705 |
14 | 171348 |
15 | 511899 |
16 | 1608540 |
17 | 4861373 |
18 | 14726040 |
19 | 45536993 |
20 | 138776184 |
21 | 426552305 |
22 | 1305642816 |
23 | 3998654049 |
24 | 12283464960 |
25 | 37639150053 |
26 | 115651510068 |
27 | 355188064346 |
28 | 1090663423924 |
[1,0,1,0,8,8,71,212,731,1840,5953,18632,54705, 171348,511899,1608540,4861373,14726040,45536993, 138776184,426552305,1305642816,3998654049, 12283464960,37639150053,115651510068,355188064346, 1090663423924] |