n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 4 |
4 | 52 |
5 | 532 |
6 | 4772 |
7 | 44624 |
8 | 413332 |
9 | 3704668 |
10 | 32312456 |
11 | 277318708 |
12 | 2365831332 |
13 | 20023322874 |
14 | 168065885292 |
15 | 1401084600204 |
16 | 11617827516556 |
17 | 95910742322858 |
18 | 788559509624036 |
19 | 6459527069162538 |
20 | 52742304806108492 |
21 | 429408151732020490 |
22 | 3487057360672870112 |
[0,0,0,4,52,532,4772,44624,413332,3704668, 32312456,277318708,2365831332,20023322874, 168065885292,1401084600204,11617827516556, 95910742322858,788559509624036,6459527069162538, 52742304806108492,429408151732020490, 3487057360672870112] |