n | a(n) |
---|---|
1 | 3 |
2 | 15 |
3 | 55 |
4 | 173 |
5 | 511 |
6 | 1451 |
7 | 4019 |
8 | 10937 |
9 | 29371 |
10 | 78055 |
11 | 205679 |
12 | 538149 |
13 | 1399607 |
14 | 3621315 |
15 | 9327723 |
16 | 23931633 |
17 | 61186163 |
18 | 155949119 |
19 | 396369831 |
20 | 1004904733 |
21 | 2541896559 |
22 | 6416348251 |
23 | 16165611043 |
24 | 40657256617 |
25 | 102090514731 |
26 | 255968753175 |
27 | 640899345631 |
28 | 1602640560533 |
[3,15,55,173,511,1451,4019,10937,29371,78055, 205679,538149,1399607,3621315,9327723,23931633, 61186163,155949119,396369831,1004904733, 2541896559,6416348251,16165611043,40657256617, 102090514731,255968753175,640899345631, 1602640560533] |