n | a(n) |
---|---|
0 | -1 |
1 | 1 |
2 | 2 |
3 | 2 |
4 | 7 |
5 | 18 |
6 | 61 |
7 | 198 |
8 | 694 |
9 | 2446 |
10 | 8873 |
11 | 32556 |
12 | 121243 |
13 | 455986 |
14 | 1731459 |
15 | 6625258 |
16 | 25527571 |
17 | 98947914 |
18 | 385587017 |
19 | 1509702496 |
20 | 5936181673 |
21 | 23430706276 |
22 | 92805006308 |
23 | 368747893980 |
24 | 1469408091637 |
25 | 5870927247410 |
[-1,1,2,2,7,18,61,198,694,2446,8873,32556,121243, 455986,1731459,6625258,25527571,98947914, 385587017,1509702496,5936181673,23430706276, 92805006308,368747893980,1469408091637, 5870927247410] |