n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 25 |
6 | 70 |
7 | 212 |
8 | 639 |
9 | 2000 |
10 | 6451 |
11 | 21617 |
12 | 71791 |
13 | 246306 |
14 | 858806 |
15 | 3031680 |
16 | 10707284 |
17 | 38611784 |
18 | 140802398 |
19 | 514700655 |
20 | 1893610027 |
21 | 7056144208 |
22 | 26475930759 |
23 | 99365898413 |
24 | 375942742181 |
25 | 1434074803915 |
26 | 5489981644607 |
27 | 21037233338679 |
28 | 81212735932262 |
29 | 315232763329880 |
30 | 1225469410310123 |
31 | 4774478236859757 |
[1,1,2,4,10,25,70,212,639,2000,6451,21617,71791, 246306,858806,3031680,10707284,38611784,140802398, 514700655,1893610027,7056144208,26475930759, 99365898413,375942742181,1434074803915, 5489981644607,21037233338679,81212735932262, 315232763329880,1225469410310123,4774478236859757] |