n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 2 |
4 | 6 |
5 | 18 |
6 | 50 |
7 | 146 |
8 | 426 |
9 | 1282 |
10 | 3810 |
11 | 11394 |
12 | 34082 |
13 | 102338 |
14 | 306658 |
15 | 919874 |
16 | 2759154 |
17 | 8276898 |
18 | 24828386 |
19 | 74484386 |
20 | 223444258 |
21 | 670326242 |
22 | 2010964770 |
23 | 6032902242 |
24 | 18098635298 |
25 | 54295809826 |
26 | 162887261410 |
27 | 488661978274 |
28 | 1465985458850 |
29 | 4397955924386 |
[1,0,2,6,18,50,146,426,1282,3810,11394,34082, 102338,306658,919874,2759154,8276898,24828386, 74484386,223444258,670326242,2010964770, 6032902242,18098635298,54295809826,162887261410, 488661978274,1465985458850,4397955924386] |