n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 17 |
3 | 58 |
4 | 186 |
5 | 546 |
6 | 1532 |
7 | 4082 |
8 | 10502 |
9 | 26096 |
10 | 63075 |
11 | 148536 |
12 | 342096 |
13 | 771744 |
14 | 1709299 |
15 | 3721792 |
16 | 7978972 |
17 | 16860328 |
18 | 35155475 |
19 | 72393580 |
20 | 147351112 |
21 | 296657196 |
22 | 591141762 |
23 | 1166570452 |
24 | 2281101159 |
25 | 4421781894 |
26 | 8500806341 |
27 | 16214549920 |
28 | 30696683828 |
[1,4,17,58,186,546,1532,4082,10502,26096,63075, 148536,342096,771744,1709299,3721792,7978972, 16860328,35155475,72393580,147351112,296657196, 591141762,1166570452,2281101159,4421781894, 8500806341,16214549920,30696683828] |