n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 10 |
4 | 18 |
5 | 90 |
6 | 210 |
7 | 1010 |
8 | 2754 |
9 | 12754 |
10 | 38626 |
11 | 173434 |
12 | 566034 |
13 | 2481578 |
14 | 8556722 |
15 | 36848994 |
16 | 132406274 |
17 | 562781730 |
18 | 2086628034 |
19 | 8786281322 |
20 | 33372861074 |
21 | 139609461370 |
22 | 540319600530 |
23 | 2250413871698 |
24 | 8838703576002 |
25 | 36709888093938 |
26 | 145870057771938 |
[1,2,2,10,18,90,210,1010,2754,12754,38626,173434, 566034,2481578,8556722,36848994,132406274, 562781730,2086628034,8786281322,33372861074, 139609461370,540319600530,2250413871698, 8838703576002,36709888093938,145870057771938] |