n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 18 |
4 | 52 |
5 | 130 |
6 | 310 |
7 | 718 |
8 | 1618 |
9 | 3670 |
10 | 8160 |
11 | 17862 |
12 | 38872 |
13 | 84016 |
14 | 180502 |
15 | 386092 |
16 | 821640 |
17 | 1742536 |
18 | 3681130 |
19 | 7754076 |
20 | 16290046 |
21 | 34136028 |
22 | 71378568 |
23 | 148948138 |
24 | 310248240 |
25 | 645155196 |
26 | 1339484196 |
27 | 2777105128 |
28 | 5750079046 |
[1,2,6,18,52,130,310,718,1618,3670,8160,17862, 38872,84016,180502,386092,821640,1742536,3681130, 7754076,16290046,34136028,71378568,148948138, 310248240,645155196,1339484196,2777105128, 5750079046] |