n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 18 |
4 | 94 |
5 | 527 |
6 | 3108 |
7 | 18993 |
8 | 119214 |
9 | 763997 |
10 | 4978304 |
11 | 32883853 |
12 | 219690066 |
13 | 1481858835 |
14 | 10078051830 |
15 | 69030877581 |
16 | 475795428158 |
17 | 3297527987794 |
18 | 22965847261928 |
19 | 160649189379029 |
20 | 1128201207643744 |
21 | 7951399289858530 |
22 | 56222323349767666 |
[1,1,4,18,94,527,3108,18993,119214,763997,4978304, 32883853,219690066,1481858835,10078051830, 69030877581,475795428158,3297527987794, 22965847261928,160649189379029,1128201207643744, 7951399289858530,56222323349767666] |