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 | -1 |
| 2 | -8 |
| 3 | -19 |
| 4 | -13 |
| 5 | 131 |
| 6 | 497 |
| 7 | 1149 |
| 8 | 662 |
| 9 | -4780 |
| 10 | -22394 |
| 11 | -55992 |
| 12 | -75053 |
| 13 | 44519 |
| 14 | 614871 |
| 15 | 2048356 |
| 16 | 4311107 |
| 17 | 4894537 |
| 18 | -4917495 |
| 19 | -44555890 |
| 20 | -140584885 |
| 21 | -292542844 |
| 22 | -369256294 |
| 23 | 110050979 |
| 24 | 2247025840 |
| 25 | 7757437455 |
| 26 | 17600976064 |
| 27 | 27240355017 |
| 28 | 15747025855 |
| 29 | -71354553868 |