n | a(n) |
---|---|
0 | 1 |
1 | 8 |
2 | 30 |
3 | 110 |
4 | 406 |
5 | 1512 |
6 | 5676 |
7 | 21450 |
8 | 81510 |
9 | 311168 |
10 | 1192516 |
11 | 4585308 |
12 | 17681020 |
13 | 68346800 |
14 | 264769560 |
15 | 1027653570 |
16 | 3995416710 |
17 | 15557374800 |
18 | 60660114900 |
19 | 236813267460 |
20 | 925540979220 |
21 | 3621007518960 |
22 | 14179797364200 |
23 | 55575657411300 |
24 | 217993800897756 |
25 | 855702566655552 |
[1,8,30,110,406,1512,5676,21450,81510,311168, 1192516,4585308,17681020,68346800,264769560, 1027653570,3995416710,15557374800,60660114900, 236813267460,925540979220,3621007518960, 14179797364200,55575657411300,217993800897756, 855702566655552] |