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 | 3 |
| 3 | 10 |
| 4 | 41 |
| 5 | 76 |
| 6 | -2183 |
| 7 | -54998 |
| 8 | -1045567 |
| 9 | -15948296 |
| 10 | -157645999 |
| 11 | 2035442014 |
| 12 | 217585291057 |
| 13 | 10000385378452 |
| 14 | 373813151971001 |
| 15 | 11759936127330346 |
| 16 | 269243105500780673 |
| 17 | -519586631788126352 |
| 18 | -649842878319124373855 |
| 19 | -59793494397006229506890 |