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 | 9 |
| 2 | 35 |
| 3 | -38 |
| 4 | 39 |
| 5 | -51 |
| 6 | 69 |
| 7 | -374 |
| 8 | -4521 |
| 9 | 7869 |
| 10 | 10426 |
| 11 | 12639 |
| 12 | -16094 |
| 13 | -29354 |
| 14 | 102579 |
| 15 | -103881 |
| 16 | 1295206 |
| 17 | -3298514 |
| 18 | 4267318 |
| 19 | 478642449 |
| 20 | -2120241621 |