n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 20 |
4 | 60 |
5 | 190 |
6 | 561 |
7 | 1651 |
8 | 4720 |
9 | 13300 |
10 | 36716 |
11 | 99872 |
12 | 267836 |
13 | 708890 |
14 | 1854255 |
15 | 4796273 |
16 | 12279445 |
17 | 31135188 |
18 | 78236006 |
19 | 194921680 |
20 | 481758832 |
21 | 1181675902 |
22 | 2877646681 |
23 | 6959866116 |
24 | 16723591530 |
25 | 39934902812 |
26 | 94795718409 |
27 | 223741936855 |
28 | 525206126933 |
29 | 1226393510220 |
[1,1,5,20,60,190,561,1651,4720,13300,36716,99872, 267836,708890,1854255,4796273,12279445,31135188, 78236006,194921680,481758832,1181675902, 2877646681,6959866116,16723591530,39934902812, 94795718409,223741936855,525206126933, 1226393510220] |