n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 92 |
5 | 252 |
6 | 628 |
7 | 1644 |
8 | 4052 |
9 | 10340 |
10 | 25332 |
11 | 63708 |
12 | 155452 |
13 | 387036 |
14 | 941948 |
15 | 2328740 |
16 | 5657236 |
17 | 13914596 |
18 | 33757804 |
19 | 82713164 |
20 | 200467108 |
21 | 489746916 |
22 | 1186060492 |
23 | 2891000036 |
24 | 6997192716 |
25 | 17025058164 |
26 | 41186981772 |
27 | 100070851212 |
28 | 242000513660 |
29 | 587312389940 |
[1,4,12,36,92,252,628,1644,4052,10340,25332,63708, 155452,387036,941948,2328740,5657236,13914596, 33757804,82713164,200467108,489746916,1186060492, 2891000036,6997192716,17025058164,41186981772, 100070851212,242000513660,587312389940] |