n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 64 |
5 | 348 |
6 | 2216 |
7 | 16208 |
8 | 134096 |
9 | 1239280 |
10 | 12660992 |
11 | 141749472 |
12 | 1726315648 |
13 | 22725602368 |
14 | 321611064448 |
15 | 4869617171456 |
16 | 78557096872192 |
17 | 1345209881170176 |
18 | 24370892054807552 |
19 | 465737368803683840 |
20 | 9363489160183291904 |
[1,1,4,14,64,348,2216,16208,134096,1239280, 12660992,141749472,1726315648,22725602368, 321611064448,4869617171456,78557096872192, 1345209881170176,24370892054807552, 465737368803683840,9363489160183291904] |