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 | 4 |
| 3 | 6 |
| 4 | 18 |
| 5 | 50 |
| 6 | 54 |
| 7 | 162 |
| 8 | 242 |
| 9 | 450 |
| 10 | 486 |
| 11 | 882 |
| 12 | 1058 |
| 13 | 1782 |
| 14 | 3042 |
| 15 | 3078 |
| 16 | 4050 |
| 17 | 5202 |
| 18 | 9522 |
| 19 | 19602 |
| 20 | 22050 |
| 21 | 36450 |
| 22 | 46818 |
| 23 | 54450 |
| 24 | 66978 |
| 25 | 71442 |
| 26 | 95922 |
| 27 | 124002 |
| 28 | 149058 |
| 29 | 183618 |
| 30 | 190962 |
| 31 | 238050 |
| 32 | 240570 |
| 33 | 263538 |
| 34 | 277830 |
| 35 | 328050 |
| 36 | 466578 |
| 37 | 684450 |
| 38 | 816642 |
| 39 | 977202 |