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 | 3 |
| 2 | 23 |
| 3 | 23 |
| 4 | 73 |
| 5 | 121 |
| 6 | 231 |
| 7 | 422 |
| 8 | 865 |
| 9 | 1729 |
| 10 | 3286 |
| 11 | 6319 |
| 12 | 12563 |
| 13 | 24164 |
| 14 | 46151 |
| 15 | 91180 |
| 16 | 179529 |
| 17 | 348543 |
| 18 | 679612 |
| 19 | 1324925 |
| 20 | 2580453 |
| 21 | 5044253 |
| 22 | 9857924 |
| 23 | 19226398 |
| 24 | 37521143 |
| 25 | 73217267 |
| 26 | 142924098 |
| 27 | 278999274 |
| 28 | 544730946 |
| 29 | 1063235208 |
| 30 | 2075512334 |
| 31 | 4051405413 |