n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 6 |
3 | 24 |
4 | 96 |
5 | 390 |
6 | 1582 |
7 | 6422 |
8 | 26062 |
9 | 105768 |
10 | 429228 |
11 | 1741898 |
12 | 7068978 |
13 | 28687370 |
14 | 116419254 |
15 | 472453328 |
16 | 1917312976 |
17 | 7780851238 |
18 | 31576298030 |
19 | 128143125598 |
20 | 520031215214 |
21 | 2110393854816 |
22 | 8564413235420 |
23 | 34756154117738 |
24 | 141047636989250 |
25 | 572400382184434 |
26 | 2322918728158854 |
27 | 9426882974883464 |
[0,2,6,24,96,390,1582,6422,26062,105768,429228, 1741898,7068978,28687370,116419254,472453328, 1917312976,7780851238,31576298030,128143125598, 520031215214,2110393854816,8564413235420, 34756154117738,141047636989250,572400382184434, 2322918728158854,9426882974883464] |