n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 11 |
5 | 40 |
6 | 138 |
7 | 512 |
8 | 1903 |
9 | 7256 |
10 | 27910 |
11 | 108704 |
12 | 426702 |
13 | 1688080 |
14 | 6719252 |
15 | 26895360 |
16 | 108171319 |
17 | 436935544 |
18 | 1771673454 |
19 | 7208637920 |
20 | 29422782282 |
21 | 120436341360 |
22 | 494277785356 |
23 | 2033457590656 |
24 | 8384379887334 |
25 | 34642507651952 |
26 | 143413034719036 |
27 | 594776592764224 |
[0,1,1,4,11,40,138,512,1903,7256,27910,108704, 426702,1688080,6719252,26895360,108171319, 436935544,1771673454,7208637920,29422782282, 120436341360,494277785356,2033457590656, 8384379887334,34642507651952,143413034719036, 594776592764224] |