n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | 72 |
5 | 540 |
6 | 3240 |
7 | 17010 |
8 | 81648 |
9 | 367416 |
10 | 1574640 |
11 | 6495390 |
12 | 25981560 |
13 | 101328084 |
14 | 386889048 |
15 | 1450833930 |
16 | 5356925280 |
17 | 19514513520 |
18 | 70252248672 |
19 | 250273635894 |
20 | 883318714920 |
21 | 3091615502220 |
22 | 10739295955080 |
23 | 37050571045026 |
24 | 127030529297232 |
25 | 433058622604200 |
26 | 1468633589701200 |
[0,0,0,6,72,540,3240,17010,81648,367416,1574640, 6495390,25981560,101328084,386889048,1450833930, 5356925280,19514513520,70252248672,250273635894, 883318714920,3091615502220,10739295955080, 37050571045026,127030529297232,433058622604200, 1468633589701200] |