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 | 4 |
| 2 | 18 |
| 3 | 58 |
| 4 | 134 |
| 5 | 178 |
| 6 | 424 |
| 7 | 598 |
| 8 | 1344 |
| 9 | 4254 |
| 10 | 5998 |
| 11 | 57630 |
| 12 | 58740 |
| 13 | 59998 |
| 14 | 127404 |
| 15 | 424414 |
| 16 | 425344 |
| 17 | 599998 |
| 18 | 1273554 |
| 19 | 4244414 |
| 20 | 5722840 |
| 21 | 5999998 |
| 22 | 18886848 |
| 23 | 42683384 |
| 24 | 57725768 |
| 25 | 59999998 |
| 26 | 424650414 |
| 27 | 578107368 |
| 28 | 588254658 |
| 29 | 588349340 |