n | a(n) |
---|---|
1 | 4 |
2 | 15 |
3 | 45 |
4 | 152 |
5 | 511 |
6 | 1681 |
7 | 5588 |
8 | 18575 |
9 | 61621 |
10 | 204608 |
11 | 679407 |
12 | 2255577 |
13 | 7488924 |
14 | 24864735 |
15 | 82554557 |
16 | 274095080 |
17 | 910042783 |
18 | 3021494049 |
19 | 10031871012 |
20 | 33307511407 |
21 | 110586567109 |
22 | 367166113104 |
23 | 1219053634447 |
24 | 4047464337257 |
[4,15,45,152,511,1681,5588,18575,61621,204608, 679407,2255577,7488924,24864735,82554557, 274095080,910042783,3021494049,10031871012, 33307511407,110586567109,367166113104, 1219053634447,4047464337257] |