n | a(n) |
---|---|
0 | 2 |
1 | 6 |
2 | 10 |
3 | 40 |
4 | 80 |
5 | 250 |
6 | 510 |
7 | 1890 |
8 | 4270 |
9 | 13738 |
10 | 30630 |
11 | 101960 |
12 | 234864 |
13 | 705046 |
14 | 1580578 |
15 | 5136840 |
16 | 11991928 |
17 | 36095322 |
18 | 82990606 |
19 | 255579576 |
20 | 595920680 |
21 | 1719038038 |
22 | 3926998938 |
23 | 11665004238 |
24 | 26978093154 |
25 | 75938910058 |
26 | 172678519950 |
27 | 489262646480 |
28 | 1114189211016 |
[2,6,10,40,80,250,510,1890,4270,13738,30630, 101960,234864,705046,1580578,5136840,11991928, 36095322,82990606,255579576,595920680,1719038038, 3926998938,11665004238,26978093154,75938910058, 172678519950,489262646480,1114189211016] |