n | a(n) |
---|---|
1 | 2 |
2 | 6 |
3 | 19 |
4 | 55 |
5 | 178 |
6 | 572 |
7 | 1798 |
8 | 5700 |
9 | 18064 |
10 | 57249 |
11 | 181433 |
12 | 574924 |
13 | 1821857 |
14 | 5773450 |
15 | 18295845 |
16 | 57978643 |
17 | 183731482 |
18 | 582236576 |
19 | 1845081304 |
20 | 5846978390 |
21 | 18528805856 |
22 | 58716935815 |
23 | 186071279593 |
24 | 589651361292 |
25 | 1868578146701 |
26 | 5921438527588 |
[2,6,19,55,178,572,1798,5700,18064,57249,181433, 574924,1821857,5773450,18295845,57978643, 183731482,582236576,1845081304,5846978390, 18528805856,58716935815,186071279593,589651361292, 1868578146701,5921438527588] |