n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 90 |
4 | 2520 |
5 | 41580 |
6 | 516180 |
7 | 6068622 |
8 | 76331906 |
9 | 958679970 |
10 | 11679900408 |
11 | 138047313960 |
12 | 1610654864328 |
13 | 18649754961744 |
14 | 214256589488616 |
15 | 2439692058769566 |
16 | 27562317214408488 |
17 | 309367132582535226 |
18 | 3453299423388485028 |
19 | 38354816922190327314 |
20 | 424048220090513056908 |
[1,1,6,90,2520,41580,516180,6068622,76331906, 958679970,11679900408,138047313960,1610654864328, 18649754961744,214256589488616,2439692058769566, 27562317214408488,309367132582535226, 3453299423388485028,38354816922190327314, 424048220090513056908] |