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 | 9 |
| 2 | 18 |
| 3 | 36 |
| 4 | 72 |
| 5 | 99 |
| 6 | 198 |
| 7 | 387 |
| 8 | 765 |
| 9 | 1332 |
| 10 | 2565 |
| 11 | 5121 |
| 12 | 6246 |
| 13 | 8712 |
| 14 | 9990 |
| 15 | 10989 |
| 16 | 12888 |
| 17 | 25776 |
| 18 | 51453 |
| 19 | 64908 |
| 20 | 69597 |
| 21 | 126396 |
| 22 | 250065 |
| 23 | 252621 |
| 24 | 374877 |
| 25 | 722655 |
| 26 | 948222 |
| 27 | 1170711 |
| 28 | 1281888 |
| 29 | 2410776 |
| 30 | 2535453 |
| 31 | 4870008 |
| 32 | 4874796 |
| 33 | 9342585 |
| 34 | 11688174 |
| 35 | 22834962 |
| 36 | 45069651 |