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A003513 as a simple table
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 27 |
| 6 | 192 |
| 7 | 2280 |
| 8 | 47097 |
| 9 | 1735803 |
| 10 | 115867758 |
| 11 | 14137353466 |
| 12 | 3172486137982 |
| 13 | 1315460211433262 |
| 14 | 1011773137731861712 |
| 15 | 1448486351628212391462 |
| 16 | 3872217739919424676743213 |
[1,2,6,27,192,2280,47097,1735803,115867758, 14137353466,3172486137982,1315460211433262, 1011773137731861712,1448486351628212391462, 3872217739919424676743213] |