n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 28 |
4 | 244 |
5 | 1680 |
6 | 10214 |
7 | 57476 |
8 | 305476 |
9 | 1553632 |
10 | 7641218 |
11 | 36608932 |
12 | 171666468 |
13 | 790650724 |
14 | 3586822020 |
15 | 16062938368 |
16 | 71135451440 |
17 | 311964025352 |
18 | 1356392904818 |
19 | 5852609697844 |
20 | 25081266854732 |
[1,2,28,244,1680,10214,57476,305476,1553632, 7641218,36608932,171666468,790650724,3586822020, 16062938368,71135451440,311964025352, 1356392904818,5852609697844,25081266854732] |