n | a(n) |
---|---|
0 | 1 |
1 | 12 |
2 | 54 |
3 | 198 |
4 | 842 |
5 | 3622 |
6 | 15984 |
7 | 71468 |
8 | 323042 |
9 | 1472022 |
10 | 6751064 |
11 | 31123148 |
12 | 144092684 |
13 | 669468708 |
14 | 3119587196 |
15 | 14572658668 |
16 | 68216250402 |
17 | 319893194558 |
18 | 1502357897232 |
19 | 7064711394284 |
20 | 33257109397452 |
21 | 156701323391972 |
[1,12,54,198,842,3622,15984,71468,323042,1472022, 6751064,31123148,144092684,669468708,3119587196, 14572658668,68216250402,319893194558, 1502357897232,7064711394284,33257109397452, 156701323391972] |