n | a(n) |
---|---|
2 | 6 |
3 | 21 |
4 | 138 |
5 | 781 |
6 | 4836 |
7 | 30099 |
8 | 191698 |
9 | 1236024 |
10 | 8063492 |
11 | 53086930 |
12 | 352249244 |
13 | 2352800079 |
14 | 15805224904 |
15 | 106702428453 |
16 | 723509453442 |
17 | 4924851788720 |
18 | 33638721268140 |
19 | 230477992427450 |
20 | 1583550831926508 |
21 | 10907729315809642 |
22 | 75307599054762424 |
23 | 521026923863915206 |
24 | 3611800088179535100 |
[6,21,138,781,4836,30099,191698,1236024,8063492, 53086930,352249244,2352800079,15805224904, 106702428453,723509453442,4924851788720, 33638721268140,230477992427450,1583550831926508, 10907729315809642,75307599054762424, 521026923863915206,3611800088179535100] |