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 | 3 |
| 2 | 3 |
| 3 | -3 |
| 4 | -9 |
| 5 | -3 |
| 6 | 15 |
| 7 | 18 |
| 8 | -12 |
| 9 | -42 |
| 10 | -12 |
| 11 | 63 |
| 12 | 72 |
| 13 | -45 |
| 14 | -153 |
| 15 | -51 |
| 16 | 195 |
| 17 | 228 |
| 18 | -123 |
| 19 | -435 |
| 20 | -144 |
| 21 | 540 |
| 22 | 621 |
| 23 | -321 |
| 24 | -1140 |
| 25 | -393 |
| 26 | 1332 |
| 27 | 1536 |
| 28 | -747 |
| 29 | -2700 |
| 30 | -924 |
| 31 | 3084 |
| 32 | 3528 |
| 33 | -1683 |
| 34 | -6063 |
| 35 | -2097 |
| 36 | 6714 |
| 37 | 7668 |
| 38 | -3549 |
| 39 | -12843 |
| 40 | -4425 |
| 41 | 14004 |
| 42 | 15894 |
| 43 | -7263 |
| 44 | -26208 |
| 45 | -9057 |