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 | 0 |
| 3 | 25 |
| 4 | 5 |
| 5 | -51 |
| 6 | -120 |
| 7 | 0 |
| 8 | 325 |
| 9 | 500 |
| 10 | 273 |
| 11 | -1000 |
| 12 | -2475 |
| 13 | -2575 |
| 14 | 610 |
| 15 | 7449 |
| 16 | 13885 |
| 17 | 13275 |
| 18 | -3650 |
| 19 | -37005 |
| 20 | -73075 |
| 21 | -78475 |
| 22 | -16450 |
| 23 | 130600 |
| 24 | 326860 |
| 25 | 452704 |
| 26 | 339375 |
| 27 | -174900 |
| 28 | -1082100 |
| 29 | -2092990 |
| 30 | -2553196 |
| 31 | -1602400 |
| 32 | 1426925 |
| 33 | 6411775 |
| 34 | 11803520 |
| 35 | 14448032 |
| 36 | 10108055 |