n | a(n) |
---|---|
2 | 1 |
3 | 4 |
4 | 24 |
5 | 148 |
6 | 925 |
7 | 5838 |
8 | 37128 |
9 | 237576 |
10 | 1527867 |
11 | 9867000 |
12 | 63946740 |
13 | 415683216 |
14 | 2709186844 |
15 | 17697136408 |
16 | 115833872400 |
17 | 759517409424 |
18 | 4987999112007 |
19 | 32804320226580 |
20 | 216018805979760 |
21 | 1424151150922500 |
22 | 9398957079664845 |
23 | 62090203617715350 |
24 | 410536632908307360 |
[1,4,24,148,925,5838,37128,237576,1527867,9867000, 63946740,415683216,2709186844,17697136408, 115833872400,759517409424,4987999112007, 32804320226580,216018805979760,1424151150922500, 9398957079664845,62090203617715350, 410536632908307360] |