n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 23 |
7 | 65 |
8 | 201 |
9 | 679 |
10 | 2489 |
11 | 9831 |
12 | 41673 |
13 | 188858 |
14 | 911216 |
15 | 4664879 |
16 | 25265271 |
17 | 144350862 |
18 | 867748340 |
19 | 5475788662 |
20 | 36194252078 |
21 | 250093494424 |
22 | 1803204139718 |
23 | 13543620370665 |
24 | 105800880875545 |
25 | 858375849401380 |
26 | 7222921375625584 |
[1,1,2,4,9,23,65,201,679,2489,9831,41673,188858, 911216,4664879,25265271,144350862,867748340, 5475788662,36194252078,250093494424,1803204139718, 13543620370665,105800880875545,858375849401380, 7222921375625584] |