n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 6 |
4 | 12 |
5 | 55 |
6 | 246 |
7 | 474 |
8 | 2107 |
9 | 9360 |
10 | 18018 |
11 | 80029 |
12 | 355452 |
13 | 684228 |
14 | 3039013 |
15 | 13497834 |
16 | 25982664 |
17 | 115402483 |
18 | 512562258 |
19 | 986657022 |
20 | 4382255359 |
21 | 19463867988 |
22 | 37466984190 |
23 | 166410301177 |
24 | 739114421304 |
25 | 1422758742216 |
26 | 6319209189385 |
27 | 28066884141582 |
28 | 54027365220036 |
29 | 239963538895471 |
30 | 1065802482958830 |
31 | 2051617119619170 |
[0,1,6,12,55,246,474,2107,9360,18018,80029,355452, 684228,3039013,13497834,25982664,115402483, 512562258,986657022,4382255359,19463867988, 37466984190,166410301177,739114421304, 1422758742216,6319209189385,28066884141582, 54027365220036,239963538895471,1065802482958830, 2051617119619170] |