This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | -25 |
| 4 | 1000 |
| 5 | -18125 |
| 6 | 131250 |
| 7 | 11609375 |
| 8 | -630156250 |
| 9 | 4314062500 |
| 10 | 1173535156250 |
| 11 | -38006699218750 |
| 12 | -4262573730468750 |
| 13 | 321379049072265625 |
| 14 | 20787043081054687500 |
| 15 | -3209395283374023437500 |
| 16 | -116229452332824707031250 |
| 17 | 39638105812041778564453125 |