n | a(n) |
---|---|
2 | 1 |
3 | 5 |
4 | 16 |
5 | 54 |
6 | 180 |
7 | 607 |
8 | 2098 |
9 | 7397 |
10 | 26452 |
11 | 95821 |
12 | 350554 |
13 | 1292634 |
14 | 4797694 |
15 | 17904220 |
16 | 67125898 |
17 | 252679320 |
18 | 954505718 |
19 | 3616951513 |
20 | 13744169104 |
21 | 52358244166 |
22 | 199912298266 |
23 | 764879838343 |
24 | 2932035371786 |
25 | 11259007784430 |
26 | 43303859981236 |
27 | 166800020984581 |
[1,5,16,54,180,607,2098,7397,26452,95821,350554, 1292634,4797694,17904220,67125898,252679320, 954505718,3616951513,13744169104,52358244166, 199912298266,764879838343,2932035371786, 11259007784430,43303859981236,166800020984581] |