n | a(n) |
---|---|
0 | 1 |
1 | 21 |
2 | 262 |
3 | 2525 |
4 | 20754 |
5 | 152946 |
6 | 1040556 |
7 | 6659037 |
8 | 40599130 |
9 | 237978598 |
10 | 1350216660 |
11 | 7453221490 |
12 | 40188242420 |
13 | 212349718980 |
14 | 1102352779992 |
15 | 5634083759325 |
16 | 28400234400810 |
17 | 141402315307550 |
18 | 696257439473860 |
[1,21,262,2525,20754,152946,1040556,6659037, 40599130,237978598,1350216660,7453221490, 40188242420,212349718980,1102352779992, 5634083759325,28400234400810,141402315307550, 696257439473860] |