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n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 31 |
3 | 257 |
4 | 1950 |
5 | 14164 |
6 | 100464 |
7 | 702919 |
8 | 4878575 |
9 | 33695365 |
10 | 232040622 |
11 | 1595043816 |
12 | 10952137040 |
13 | 75149854091 |
14 | 515435467055 |
15 | 3534332855753 |
16 | 24230970910510 |
17 | 166108203507452 |
18 | 1138635489987488 |
19 | 7804802111777935 |
[0,3,31,257,1950,14164,100464,702919,4878575, 33695365,232040622,1595043816,10952137040, 75149854091,515435467055,3534332855753, 24230970910510,166108203507452,1138635489987488, 7804802111777935] |