n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 26 |
5 | 66 |
6 | 171 |
7 | 440 |
8 | 1112 |
9 | 2786 |
10 | 6820 |
11 | 16720 |
12 | 41106 |
13 | 100856 |
14 | 245793 |
15 | 597030 |
16 | 1441292 |
17 | 3469486 |
18 | 8304526 |
19 | 19832076 |
20 | 47110238 |
21 | 111669014 |
[1,2,4,10,26,66,171,440,1112,2786,6820,16720, 41106,100856,245793,597030,1441292,3469486, 8304526,19832076,47110238,111669014] |