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 | 113 |
| 2 | 453 |
| 3 | 1813 |
| 4 | 7253 |
| 5 | 29013 |
| 6 | 116053 |
| 7 | 464213 |
| 8 | 1856853 |
| 9 | 7427413 |
| 10 | 29709653 |
| 11 | 118838613 |
| 12 | 475354453 |
| 13 | 1901417813 |
| 14 | 7605671253 |
| 15 | 30422685013 |
| 16 | 121690740053 |
| 17 | 486762960213 |
| 18 | 1947051840853 |
| 19 | 7788207363413 |
| 20 | 31152829453653 |
| 21 | 124611317814613 |
| 22 | 498445271258453 |
| 23 | 1993781085033813 |