n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 56 |
3 | 428 |
4 | 2741 |
5 | 13247 |
6 | 52059 |
7 | 167502 |
8 | 453377 |
9 | 1047750 |
10 | 2112634 |
11 | 3808004 |
12 | 6369041 |
13 | 10436597 |
14 | 18107008 |
15 | 36365073 |
16 | 90462493 |
17 | 282733629 |
18 | 1074838721 |
19 | 4716194782 |
20 | 22663033612 |
21 | 114269420056 |
22 | 586835167740 |
[1,4,56,428,2741,13247,52059,167502,453377, 1047750,2112634,3808004,6369041,10436597,18107008, 36365073,90462493,282733629,1074838721,4716194782, 22663033612,114269420056,586835167740] |