n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 23 |
7 | 63 |
8 | 188 |
9 | 596 |
10 | 1979 |
11 | 6804 |
12 | 24118 |
13 | 87379 |
14 | 322652 |
15 | 1209808 |
16 | 4596158 |
17 | 17657037 |
18 | 68497898 |
19 | 268006183 |
20 | 1056597059 |
21 | 4193905901 |
22 | 16748682185 |
23 | 67258011248 |
24 | 271452424286 |
25 | 1100632738565 |
26 | 4481533246014 |
[1,1,1,2,4,9,23,63,188,596,1979,6804,24118,87379, 322652,1209808,4596158,17657037,68497898, 268006183,1056597059,4193905901,16748682185, 67258011248,271452424286,1100632738565, 4481533246014] |