n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 25 |
3 | 119 |
4 | 599 |
5 | 2887 |
6 | 14039 |
7 | 67767 |
8 | 327607 |
9 | 1581751 |
10 | 7638967 |
11 | 36883895 |
12 | 178097591 |
13 | 859930039 |
14 | 4152135095 |
15 | 20048276919 |
16 | 96801746359 |
17 | 467400158647 |
18 | 2256808013239 |
19 | 10896832949687 |
20 | 52614565424567 |
21 | 254045594545591 |
[1,4,25,119,599,2887,14039,67767,327607,1581751, 7638967,36883895,178097591,859930039,4152135095, 20048276919,96801746359,467400158647, 2256808013239,10896832949687,52614565424567, 254045594545591] |