n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 23 |
3 | 155 |
4 | 1143 |
5 | 8932 |
6 | 72682 |
7 | 609348 |
8 | 5227035 |
9 | 45659020 |
10 | 404756300 |
11 | 3632075109 |
12 | 32928392154 |
13 | 301152242600 |
14 | 2775117150576 |
15 | 25741623112539 |
16 | 240162703635495 |
17 | 2252187478291088 |
18 | 21217451539791085 |
19 | 200709823787548845 |
20 | 1905712342347978340 |
[1,4,23,155,1143,8932,72682,609348,5227035, 45659020,404756300,3632075109,32928392154, 301152242600,2775117150576,25741623112539, 240162703635495,2252187478291088, 21217451539791085,200709823787548845, 1905712342347978340] |