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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 1 |
| 5 | -3 |
| 6 | -2 |
| 7 | -7 |
| 8 | 13 |
| 9 | 5 |
| 10 | 62 |
| 11 | -99 |
| 12 | 17 |
| 13 | -719 |
| 14 | 1106 |
| 15 | -923 |
| 16 | 10453 |
| 17 | -16407 |
| 18 | 24298 |
| 19 | -183655 |
| 20 | 303217 |
| 21 | -621019 |
| 22 | 3792662 |
| 23 | -6685359 |
| 24 | 16834061 |
| 25 | -90123923 |
| 26 | 170597318 |
| 27 | -494141387 |
| 28 | 2423695393 |
| 29 | -4929671655 |
| 30 | 15765512842 |
| 31 | -72793142659 |
| 32 | 158725990837 |
| 33 | -545758527919 |
| 34 | 2415313413266 |