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) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 9 |
| 4 | 19 |
| 5 | 3 |
| 6 | 49 |
| 7 | -39 |
| 8 | 151 |
| 9 | -189 |
| 10 | 381 |
| 11 | -371 |
| 12 | 219 |
| 13 | 991 |
| 14 | -4059 |
| 15 | 11473 |
| 16 | -26193 |
| 17 | 53791 |
| 18 | -100639 |
| 19 | 175107 |
| 20 | -281581 |
| 21 | 410979 |
| 22 | -506757 |
| 23 | 391647 |
| 24 | 401587 |
| 25 | -2962157 |
| 26 | 9621235 |
| 27 | -24977199 |
| 28 | 57408111 |
| 29 | -120867183 |
| 30 | 236098467 |
| 31 | -428880285 |
| 32 | 719991383 |
| 33 | -1096219131 |
| 34 | 1442605443 |
| 35 | -1401210665 |
| 36 | 99178397 |
| 37 | 4340546667 |