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 | 1 |
| 2 | 3 |
| 3 | 2 |
| 4 | 6 |
| 5 | 2 |
| 6 | 11 |
| 7 | -1 |
| 8 | 21 |
| 9 | -12 |
| 10 | 44 |
| 11 | -44 |
| 12 | 101 |
| 13 | -131 |
| 14 | 247 |
| 15 | -362 |
| 16 | 626 |
| 17 | -970 |
| 18 | 1615 |
| 19 | -2565 |
| 20 | 4201 |
| 21 | -6744 |
| 22 | 10968 |
| 23 | -17688 |
| 24 | 28681 |
| 25 | -46343 |
| 26 | 75051 |
| 27 | -121366 |
| 28 | 196446 |
| 29 | -317782 |
| 30 | 514259 |
| 31 | -832009 |
| 32 | 1346301 |
| 33 | -2178276 |
| 34 | 3524612 |
| 35 | -5702852 |
| 36 | 9227501 |
| 37 | -14930315 |
| 38 | 24157855 |
| 39 | -39088130 |
| 40 | 63246026 |
| 41 | -102334114 |