n | a(n) |
---|---|
1 | 4 |
2 | 16 |
3 | 64 |
4 | 249 |
5 | 954 |
6 | 3611 |
7 | 13544 |
8 | 50442 |
9 | 186822 |
10 | 688899 |
11 | 2531406 |
12 | 9275757 |
13 | 33912330 |
14 | 123759252 |
15 | 450985950 |
16 | 1641487455 |
17 | 5969001906 |
18 | 21688869249 |
19 | 78760649178 |
20 | 285872602590 |
21 | 1037218320720 |
22 | 3762161399673 |
23 | 13642773106086 |
24 | 49463937282915 |
[4,16,64,249,954,3611,13544,50442,186822,688899, 2531406,9275757,33912330,123759252,450985950, 1641487455,5969001906,21688869249,78760649178, 285872602590,1037218320720,3762161399673, 13642773106086,49463937282915] |