n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 6 |
3 | 18 |
4 | 75 |
5 | 342 |
6 | 1773 |
7 | 9894 |
8 | 58596 |
9 | 362061 |
10 | 2314119 |
11 | 15185223 |
12 | 101830986 |
13 | 695253993 |
14 | 4819762446 |
15 | 33851833506 |
16 | 240472935735 |
17 | 1725315714729 |
18 | 12487872432924 |
19 | 91097741283408 |
20 | 669227023979088 |
21 | 4947500029023540 |
22 | 36786363204267282 |
23 | 274949933519917908 |
[1,3,6,18,75,342,1773,9894,58596,362061,2314119, 15185223,101830986,695253993,4819762446, 33851833506,240472935735,1725315714729, 12487872432924,91097741283408,669227023979088, 4947500029023540,36786363204267282, 274949933519917908] |