n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 15 |
4 | 76 |
5 | 665 |
6 | 5286 |
7 | 56287 |
8 | 597080 |
9 | 7601841 |
10 | 99702730 |
11 | 1484554511 |
12 | 23049638052 |
13 | 393702612745 |
14 | 7036703742446 |
15 | 135702811542495 |
16 | 2737989749177776 |
17 | 58848546456947297 |
18 | 1321063959370833810 |
19 | 31310238786268648591 |
20 | 773291778432688011260 |
21 | 20031956775840631151481 |
[0,1,2,15,76,665,5286,56287,597080,7601841, 99702730,1484554511,23049638052,393702612745, 7036703742446,135702811542495,2737989749177776, 58848546456947297,1321063959370833810, 31310238786268648591,773291778432688011260, 20031956775840631151481] |