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 | 6 |
| 3 | 18 |
| 4 | 30 |
| 5 | 198 |
| 6 | 462 |
| 7 | 1482 |
| 8 | 2550 |
| 9 | 3330 |
| 10 | 4422 |
| 11 | 9042 |
| 12 | 11778 |
| 13 | 26862 |
| 14 | 38610 |
| 15 | 47058 |
| 16 | 60258 |
| 17 | 62130 |
| 18 | 65538 |
| 19 | 69498 |
| 20 | 79902 |
| 21 | 96222 |
| 22 | 106782 |
| 23 | 124542 |
| 24 | 143262 |
| 25 | 149058 |
| 26 | 151902 |
| 27 | 184830 |
| 28 | 200382 |
| 29 | 208962 |
| 30 | 225342 |
| 31 | 237690 |
| 32 | 249858 |
| 33 | 251262 |
| 34 | 295038 |
| 35 | 301182 |
| 36 | 312702 |
| 37 | 345462 |
| 38 | 348462 |