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 | 5 |
| 3 | -10 |
| 4 | 18 |
| 5 | -32 |
| 6 | 55 |
| 7 | -90 |
| 8 | 144 |
| 9 | -226 |
| 10 | 346 |
| 11 | -522 |
| 12 | 777 |
| 13 | -1138 |
| 14 | 1648 |
| 15 | -2362 |
| 16 | 3348 |
| 17 | -4704 |
| 18 | 6554 |
| 19 | -9056 |
| 20 | 12425 |
| 21 | -16932 |
| 22 | 22922 |
| 23 | -30848 |
| 24 | 41282 |
| 25 | -54946 |
| 26 | 72768 |
| 27 | -95914 |
| 28 | 125842 |
| 29 | -164402 |
| 30 | 213901 |
| 31 | -277204 |
| 32 | 357904 |
| 33 | -460448 |
| 34 | 590330 |
| 35 | -754368 |
| 36 | 960948 |
| 37 | -1220370 |