n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 5 |
5 | 12 |
6 | 33 |
7 | 87 |
8 | 252 |
9 | 703 |
10 | 2105 |
11 | 6099 |
12 | 18689 |
13 | 55639 |
14 | 173423 |
15 | 526937 |
16 | 1664094 |
17 | 5137233 |
18 | 16393315 |
19 | 51255709 |
20 | 164951529 |
21 | 521138861 |
22 | 1688959630 |
23 | 5382512216 |
24 | 17547919924 |
25 | 56335234064 |
26 | 184596351277 |
27 | 596362337295 |
28 | 1962723402375 |
[1,2,5,12,33,87,252,703,2105,6099,18689,55639, 173423,526937,1664094,5137233,16393315,51255709, 164951529,521138861,1688959630,5382512216, 17547919924,56335234064,184596351277,596362337295, 1962723402375] |