n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 48 |
5 | 315 |
6 | 2520 |
7 | 23415 |
8 | 248640 |
9 | 2972025 |
10 | 39463200 |
11 | 576413145 |
12 | 9184855680 |
13 | 158550787395 |
14 | 2947473809280 |
15 | 58707685211175 |
16 | 1247293022976000 |
17 | 28156003910859825 |
18 | 672972205556851200 |
19 | 16978695795089253225 |
20 | 450907982644863744000 |
21 | 12573634144960773960075 |
[1,1,2,9,48,315,2520,23415,248640,2972025, 39463200,576413145,9184855680,158550787395, 2947473809280,58707685211175,1247293022976000, 28156003910859825,672972205556851200, 16978695795089253225,450907982644863744000, 12573634144960773960075] |