n | a(n) |
---|---|
0 | 2 |
1 | 9 |
2 | 40 |
3 | 178 |
4 | 792 |
5 | 3524 |
6 | 15680 |
7 | 69768 |
8 | 310432 |
9 | 1381264 |
10 | 6145920 |
11 | 27346208 |
12 | 121676672 |
13 | 541399104 |
14 | 2408949760 |
15 | 10718597248 |
16 | 47692288512 |
17 | 212206348544 |
18 | 944209971200 |
19 | 4201252581888 |
20 | 18693430269952 |
21 | 83176226243584 |
22 | 370091765514240 |
23 | 1646719514544128 |
[2,9,40,178,792,3524,15680,69768,310432,1381264, 6145920,27346208,121676672,541399104,2408949760, 10718597248,47692288512,212206348544,944209971200, 4201252581888,18693430269952,83176226243584, 370091765514240,1646719514544128] |