n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 4 |
3 | 60 |
4 | 556 |
5 | 5328 |
6 | 45316 |
7 | 405636 |
8 | 3583136 |
9 | 30801264 |
10 | 261702184 |
11 | 2204389124 |
12 | 18485952896 |
13 | 154072120428 |
14 | 1276431617512 |
15 | 10525735832272 |
16 | 86463238965520 |
17 | 707822586795020 |
18 | 5776135319900600 |
19 | 47001025464956044 |
20 | 381480686633266156 |
21 | 3089168335328298424 |
22 | 24963223479997963992 |
[0,0,4,60,556,5328,45316,405636,3583136,30801264, 261702184,2204389124,18485952896,154072120428, 1276431617512,10525735832272,86463238965520, 707822586795020,5776135319900600, 47001025464956044,381480686633266156, 3089168335328298424,24963223479997963992] |