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 | -5 |
| 2 | 10 |
| 3 | -15 |
| 4 | 30 |
| 5 | -56 |
| 6 | 85 |
| 7 | -130 |
| 8 | 205 |
| 9 | -315 |
| 10 | 465 |
| 11 | -665 |
| 12 | 960 |
| 13 | -1380 |
| 14 | 1925 |
| 15 | -2651 |
| 16 | 3660 |
| 17 | -5020 |
| 18 | 6775 |
| 19 | -9070 |
| 20 | 12126 |
| 21 | -16115 |
| 22 | 21220 |
| 23 | -27765 |
| 24 | 36235 |
| 25 | -47101 |
| 26 | 60810 |
| 27 | -78115 |
| 28 | 100105 |
| 29 | -127825 |
| 30 | 162391 |
| 31 | -205530 |
| 32 | 259475 |
| 33 | -326565 |