n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 15 |
4 | 61 |
5 | 269 |
6 | 1245 |
7 | 5935 |
8 | 29128 |
9 | 145871 |
10 | 743421 |
11 | 3843154 |
12 | 20108453 |
13 | 106304763 |
14 | 567011174 |
15 | 3047948601 |
16 | 16496553378 |
17 | 89828010025 |
18 | 491790403030 |
19 | 2705562067688 |
20 | 14949910812086 |
21 | 82936556715572 |
22 | 461770124064327 |
23 | 2579548304347117 |
24 | 14453779059407019 |
25 | 81214726367783785 |
26 | 457521215541829301 |
[1,1,4,15,61,269,1245,5935,29128,145871,743421, 3843154,20108453,106304763,567011174,3047948601, 16496553378,89828010025,491790403030, 2705562067688,14949910812086,82936556715572, 461770124064327,2579548304347117, 14453779059407019,81214726367783785, 457521215541829301] |