n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 36 |
6 | 116 |
7 | 382 |
8 | 1287 |
9 | 4420 |
10 | 15397 |
11 | 54264 |
12 | 193154 |
13 | 693374 |
14 | 2507288 |
15 | 9124560 |
16 | 33393355 |
17 | 122821380 |
18 | 453756765 |
19 | 1683107800 |
20 | 6265751310 |
21 | 23402516280 |
22 | 87670790155 |
23 | 329337229104 |
24 | 1240292449350 |
25 | 4681874312510 |
26 | 17711376176718 |
27 | 67135842263728 |
28 | 254956353358682 |
[1,1,2,4,12,36,116,382,1287,4420,15397,54264, 193154,693374,2507288,9124560,33393355,122821380, 453756765,1683107800,6265751310,23402516280, 87670790155,329337229104,1240292449350, 4681874312510,17711376176718,67135842263728, 254956353358682] |