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 | 2 |
| 2 | 13 |
| 3 | 113 |
| 4 | 1223 |
| 5 | 12113 |
| 6 | 121283 |
| 7 | 1237547 |
| 8 | 12184967 |
| 9 | 124536947 |
| 10 | 1219861613 |
| 11 | 12181833347 |
| 12 | 121339693967 |
| 13 | 1213536676883 |
| 14 | 12673876537547 |
| 15 | 121848768729173 |
| 16 | 1275463876537547 |
| 17 | 12429121339693967 |
| 18 | 165678739293946997 |
| 19 | 1276812967623946997 |
| 20 | 15396334245663786197 |
| 21 | 315396334245663786197 |
| 22 | 5918918997653319693967 |
| 23 | 57686312646216567629137 |
| 24 | 357686312646216567629137 |