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 | 1 |
| 1 | 9 |
| 2 | 2169 |
| 3 | 1306809 |
| 4 | 1469709369 |
| 5 | 2656472295609 |
| 6 | 7042235448544569 |
| 7 | 25740278881968596409 |
| 8 | 124066865052334175027769 |
| 9 | 762445058190042799428289209 |
| 10 | 5818666543923901596429593478969 |
| 11 | 53987940899344324456042542132654009 |
| 12 | 598504142090716188282023260396781018169 |