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 | 4 |
| 3 | 9 |
| 4 | 15 |
| 5 | 20 |
| 6 | 23 |
| 7 | 23 |
| 8 | 20 |
| 9 | 11 |
| 10 | -2 |
| 11 | -21 |
| 12 | -46 |
| 13 | -76 |
| 14 | -111 |
| 15 | -150 |
| 16 | -194 |
| 17 | -240 |
| 18 | -289 |
| 19 | -339 |
| 20 | -389 |
| 21 | -437 |
| 22 | -484 |
| 23 | -527 |
| 24 | -566 |
| 25 | -599 |
| 26 | -626 |
| 27 | -645 |
| 28 | -656 |
| 29 | -658 |
| 30 | -649 |
| 31 | -630 |
| 32 | -600 |
| 33 | -559 |
| 34 | -505 |
| 35 | -440 |
| 36 | -362 |
| 37 | -273 |
| 38 | -171 |
| 39 | -58 |
| 40 | 66 |
| 41 | 201 |
| 42 | 346 |
| 43 | 501 |
| 44 | 664 |
| 45 | 835 |
| 46 | 1013 |
| 47 | 1197 |
| 48 | 1385 |
| 49 | 1577 |
| 50 | 1772 |
| 51 | 1968 |
| 52 | 2164 |
| 53 | 2359 |
| 54 | 2551 |
| 55 | 2740 |