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A004019 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 25 |
| 4 | 676 |
| 5 | 458329 |
| 6 | 210066388900 |
| 7 | 44127887745906175987801 |
| 8 | 1947270476915296449559703445493848930452791204 |
| 9 | 3791862310265926082868235028027893277370233152247388584761734150717768254410341175325352025 |
[0,1,4,25,676,458329,210066388900, 44127887745906175987801, 1947270476915296449559703445493848930452791204, 37918623102659260828682350280278932773702331522473\ 88584761734150717768254410341175325352025] |