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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 6 |
| 5 | 8 |
| 6 | 12 |
| 7 | 24 |
| 8 | 39 |
| 9 | -2 |
| 10 | -295 |
| 11 | -1308 |
| 12 | -3980 |
| 13 | -9996 |
| 14 | -22150 |
| 15 | -44808 |
| 16 | -84483 |
| 17 | -150534 |
| 18 | -256001 |
| 19 | -418588 |
| 20 | -661806 |
| 21 | -1016288 |
| 22 | -1521288 |
| 23 | -2226376 |
| 24 | -3193341 |
| 25 | -4498314 |
| 26 | -6234123 |
| 27 | -8512892 |
| 28 | -11468896 |
| 29 | -15261684 |
| 30 | -20079482 |
| 31 | -26142888 |