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 | 4 |
| 2 | 15 |
| 3 | 51 |
| 4 | 146 |
| 5 | 273 |
| 6 | -319 |
| 7 | -6374 |
| 8 | -36235 |
| 9 | -113833 |
| 10 | 69388 |
| 11 | 3772035 |
| 12 | 28631669 |
| 13 | 112704452 |
| 14 | -96418909 |
| 15 | -5652669753 |
| 16 | -50538496446 |
| 17 | -230554460867 |
| 18 | 281597003109 |
| 19 | 16303457144146 |
| 20 | 166512491229617 |
| 21 | 872578914956059 |
| 22 | -1111135578108284 |
| 23 | -78512971676777833 |
| 24 | -919653124088665479 |