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 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | -2 |
| 6 | -3 |
| 7 | -3 |
| 8 | -3 |
| 9 | -2 |
| 10 | -1 |
| 11 | 1 |
| 12 | 3 |
| 13 | 6 |
| 14 | 9 |
| 15 | 12 |
| 16 | 15 |
| 17 | 18 |
| 18 | 21 |
| 19 | 23 |
| 20 | 25 |
| 21 | 26 |
| 22 | 27 |
| 23 | 26 |
| 24 | 25 |
| 25 | 22 |
| 26 | 19 |
| 27 | 13 |
| 28 | 7 |
| 29 | -2 |
| 30 | -11 |
| 31 | -23 |
| 32 | -35 |
| 33 | -50 |
| 34 | -65 |
| 35 | -83 |
| 36 | -101 |
| 37 | -122 |
| 38 | -143 |
| 39 | -166 |
| 40 | -189 |
| 41 | -214 |
| 42 | -239 |
| 43 | -265 |
| 44 | -291 |
| 45 | -318 |
| 46 | -345 |
| 47 | -371 |
| 48 | -397 |
| 49 | -422 |
| 50 | -447 |
| 51 | -469 |
| 52 | -491 |
| 53 | -510 |
| 54 | -529 |
| 55 | -542 |
| 56 | -555 |
| 57 | -562 |
| 58 | -569 |
| 59 | -567 |
| 60 | -565 |
| 61 | -554 |
| 62 | -543 |
| 63 | -520 |
| 64 | -497 |
| 65 | -462 |