n | a(n) |
---|---|
0 | 1 |
1 | 7 |
2 | 35 |
3 | 147 |
4 | 553 |
5 | 1925 |
6 | 6321 |
7 | 19825 |
8 | 59906 |
9 | 175504 |
10 | 500864 |
11 | 1397536 |
12 | 3823680 |
13 | 10282496 |
14 | 27230464 |
15 | 71129856 |
16 | 183518720 |
17 | 468213760 |
18 | 1182433280 |
19 | 2958376960 |
20 | 7338426368 |
21 | 18059821056 |
22 | 44120473600 |
23 | 107055742976 |
24 | 258122317824 |
25 | 618683957248 |
26 | 1474700509184 |
[1,7,35,147,553,1925,6321,19825,59906,175504, 500864,1397536,3823680,10282496,27230464,71129856, 183518720,468213760,1182433280,2958376960, 7338426368,18059821056,44120473600,107055742976, 258122317824,618683957248,1474700509184] |