n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 40 |
5 | 138 |
6 | 569 |
7 | 2207 |
8 | 9475 |
9 | 38862 |
10 | 171853 |
11 | 731033 |
12 | 3296604 |
13 | 14403076 |
14 | 65845587 |
15 | 293512383 |
16 | 1355814054 |
17 | 6136514157 |
18 | 28582369960 |
19 | 130907882612 |
20 | 613896177053 |
21 | 2838425700786 |
22 | 13386014505024 |
23 | 62374534078528 |
24 | 295548379214727 |
25 | 1386106527249600 |
26 | 6594151582316189 |
27 | 31095579594247858 |
[1,1,4,10,40,138,569,2207,9475,38862,171853, 731033,3296604,14403076,65845587,293512383, 1355814054,6136514157,28582369960,130907882612, 613896177053,2838425700786,13386014505024, 62374534078528,295548379214727,1386106527249600, 6594151582316189,31095579594247858] |