n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 10 |
3 | 40 |
4 | 134 |
5 | 536 |
6 | 1924 |
7 | 7696 |
8 | 28486 |
9 | 113944 |
10 | 429100 |
11 | 1716400 |
12 | 6535580 |
13 | 26142320 |
14 | 100308680 |
15 | 401234720 |
16 | 1548228166 |
17 | 6192912664 |
18 | 23999271964 |
19 | 95997087856 |
20 | 373278990004 |
21 | 1493115960016 |
22 | 5821831231160 |
23 | 23287324924640 |
24 | 91005571039516 |
25 | 364022284158064 |
[1,4,10,40,134,536,1924,7696,28486,113944,429100, 1716400,6535580,26142320,100308680,401234720, 1548228166,6192912664,23999271964,95997087856, 373278990004,1493115960016,5821831231160, 23287324924640,91005571039516,364022284158064] |