n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 68 |
3 | 1314 |
4 | 18080 |
5 | 197350 |
6 | 1836792 |
7 | 15233316 |
8 | 115776768 |
9 | 821760390 |
10 | 5520171800 |
11 | 35438827996 |
12 | 219038609088 |
13 | 1310833221724 |
14 | 7629754810160 |
15 | 43348888067400 |
16 | 241117582878720 |
17 | 1316197491501510 |
18 | 7065439665315480 |
19 | 37362065079691500 |
20 | 194909773207512000 |
21 | 1004374157379474420 |
[0,1,68,1314,18080,197350,1836792,15233316, 115776768,821760390,5520171800,35438827996, 219038609088,1310833221724,7629754810160, 43348888067400,241117582878720,1316197491501510, 7065439665315480,37362065079691500, 194909773207512000,1004374157379474420] |