n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 60 |
4 | 650 |
5 | 5352 |
6 | 37681 |
7 | 239752 |
8 | 1421226 |
9 | 7996160 |
10 | 43219990 |
11 | 226309800 |
12 | 1154900708 |
13 | 5769562736 |
14 | 28312118565 |
15 | 136830224464 |
16 | 652656300122 |
17 | 3077631550512 |
18 | 14367512295274 |
19 | 66478236840680 |
20 | 305161336656876 |
21 | 1390869368495728 |
22 | 6298727501142218 |
23 | 28358908010334960 |
[0,3,60,650,5352,37681,239752,1421226,7996160, 43219990,226309800,1154900708,5769562736, 28312118565,136830224464,652656300122, 3077631550512,14367512295274,66478236840680, 305161336656876,1390869368495728,6298727501142218, 28358908010334960] |