n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 12 |
5 | 45 |
6 | 135 |
7 | 388 |
8 | 1220 |
9 | 5401 |
10 | 27146 |
11 | 125333 |
12 | 515897 |
13 | 2010472 |
14 | 8064508 |
15 | 34936670 |
16 | 159444254 |
17 | 725890833 |
18 | 3205348045 |
19 | 13816812300 |
20 | 59601118346 |
21 | 262631332138 |
22 | 1183293213009 |
23 | 5373170070242 |
24 | 24253891624959 |
25 | 108483481246313 |
[1,1,2,12,45,135,388,1220,5401,27146,125333, 515897,2010472,8064508,34936670,159444254, 725890833,3205348045,13816812300,59601118346, 262631332138,1183293213009,5373170070242, 24253891624959,108483481246313] |