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 | 3 |
| 3 | 7 |
| 4 | 23 |
| 5 | 43 |
| 6 | 139 |
| 7 | 283 |
| 8 | 659 |
| 9 | 1319 |
| 10 | 5179 |
| 11 | 9227 |
| 12 | 23159 |
| 13 | 55399 |
| 14 | 148439 |
| 15 | 366683 |
| 16 | 793439 |
| 17 | 1953839 |
| 18 | 4875119 |
| 19 | 9750239 |
| 20 | 27353747 |
| 21 | 71815607 |
| 22 | 192287243 |
| 23 | 430893643 |