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 | 341 |
| 2 | 13981 |
| 3 | 126217 |
| 4 | 294409 |
| 5 | 2113665 |
| 6 | 4670029 |
| 7 | 127479097 |
| 8 | 140996401 |
| 9 | 509033161 |
| 10 | 8600780461 |
| 11 | 42625846021 |
| 12 | 220411358713 |
| 13 | 2382784226641 |
| 14 | 11361630988981 |
| 15 | 56308742593741 |
| 16 | 431283945022021 |
| 17 | 434124350060401 |
| 18 | 2056455209005561 |
| 19 | 5598600634063801 |
| 20 | 8178192276975721 |