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) |
|---|---|
| 1 | 1 |
| 2 | 511 |
| 3 | 9841 |
| 4 | 174251 |
| 5 | 488281 |
| 6 | 5028751 |
| 7 | 6725601 |
| 8 | 50955971 |
| 9 | 72636421 |
| 10 | 249511591 |
| 11 | 235794769 |
| 12 | 1714804091 |
| 13 | 883708281 |
| 14 | 3436782111 |
| 15 | 4805173321 |
| 16 | 13910980083 |
| 17 | 7411742281 |
| 18 | 37117211131 |
| 19 | 17927094321 |
| 20 | 85083452531 |
| 21 | 66186639441 |
| 22 | 120491126959 |
| 23 | 81870575521 |
| 24 | 501457710611 |
| 25 | 198682027181 |