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 | 0 |
| 3 | -2 |
| 4 | -5 |
| 5 | -9 |
| 6 | -14 |
| 7 | -20 |
| 8 | -27 |
| 9 | -35 |
| 10 | -44 |
| 11 | -54 |
| 12 | -65 |
| 13 | -77 |
| 14 | -90 |
| 15 | -104 |
| 16 | -119 |
| 17 | -135 |
| 18 | -152 |
| 19 | -170 |
| 20 | -189 |
| 21 | -209 |
| 22 | -230 |
| 23 | -252 |
| 24 | -275 |
| 25 | -299 |
| 26 | -324 |
| 27 | -350 |
| 28 | -377 |
| 29 | -405 |
| 30 | -434 |
| 31 | -464 |
| 32 | -495 |
| 33 | -527 |
| 34 | -560 |
| 35 | -594 |
| 36 | -629 |
| 37 | -665 |
| 38 | -702 |
| 39 | -740 |
| 40 | -779 |
| 41 | -819 |
| 42 | -860 |
| 43 | -902 |
| 44 | -945 |
| 45 | -989 |
| 46 | -1034 |
| 47 | -1080 |
| 48 | -1127 |
| 49 | -1175 |
| 50 | -1224 |
| 51 | -1274 |
| 52 | -1325 |
| 53 | -1377 |