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 | 79 |
| 3 | 679 |
| 4 | 5679 |
| 5 | 45679 |
| 6 | 345679 |
| 7 | 2345679 |
| 8 | 12345679 |
| 9 | 12345679 |
| 10 | -987654321 |
| 11 | -20987654321 |
| 12 | -320987654321 |
| 13 | -4320987654321 |
| 14 | -54320987654321 |
| 15 | -654320987654321 |
| 16 | -7654320987654321 |
| 17 | -87654320987654321 |
| 18 | -987654320987654321 |
| 19 | -10987654320987654321 |
| 20 | -120987654320987654321 |