n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 64 |
5 | 194 |
6 | 562 |
7 | 1570 |
8 | 4258 |
9 | 11266 |
10 | 29186 |
11 | 74242 |
12 | 185858 |
13 | 458754 |
14 | 1118210 |
15 | 2695170 |
16 | 6430722 |
17 | 15204354 |
18 | 35651586 |
19 | 82968578 |
20 | 191758338 |
21 | 440401922 |
22 | 1005584386 |
23 | 2283798530 |
24 | 5161091074 |
25 | 11609833474 |
26 | 26004684802 |
27 | 58015612930 |
28 | 128949682178 |
[1,2,6,20,64,194,562,1570,4258,11266,29186,74242, 185858,458754,1118210,2695170,6430722,15204354, 35651586,82968578,191758338,440401922,1005584386, 2283798530,5161091074,11609833474,26004684802, 58015612930,128949682178] |