n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 18 |
3 | 80 |
4 | 400 |
5 | 1904 |
6 | 9248 |
7 | 44544 |
8 | 215296 |
9 | 1039104 |
10 | 5018112 |
11 | 24227840 |
12 | 116985856 |
13 | 564850688 |
14 | 2727354368 |
15 | 13168803840 |
16 | 63584665600 |
17 | 307013812224 |
18 | 1482394042368 |
19 | 7157631156224 |
20 | 34560101318656 |
21 | 166870928850944 |
22 | 805724122775552 |
23 | 3890380202311680 |
24 | 18784417308737536 |
25 | 90699190027419648 |
[1,3,18,80,400,1904,9248,44544,215296,1039104, 5018112,24227840,116985856,564850688,2727354368, 13168803840,63584665600,307013812224, 1482394042368,7157631156224,34560101318656, 166870928850944,805724122775552,3890380202311680, 18784417308737536,90699190027419648] |