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 | -25 |
| 2 | 51 |
| 3 | -100 |
| 4 | 151 |
| 5 | -225 |
| 6 | 301 |
| 7 | -400 |
| 8 | 501 |
| 9 | -625 |
| 10 | 751 |
| 11 | -900 |
| 12 | 1051 |
| 13 | -1225 |
| 14 | 1401 |
| 15 | -1600 |
| 16 | 1801 |
| 17 | -2025 |
| 18 | 2251 |
| 19 | -2500 |
| 20 | 2751 |
| 21 | -3025 |
| 22 | 3301 |
| 23 | -3600 |
| 24 | 3901 |
| 25 | -4225 |
| 26 | 4551 |
| 27 | -4900 |
| 28 | 5251 |
| 29 | -5625 |
| 30 | 6001 |
| 31 | -6400 |
| 32 | 6801 |
| 33 | -7225 |
| 34 | 7651 |
| 35 | -8100 |
| 36 | 8551 |
| 37 | -9025 |
| 38 | 9501 |
| 39 | -10000 |
| 40 | 10501 |