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 | 11 |
| 3 | 27 |
| 4 | 79 |
| 5 | 223 |
| 6 | 651 |
| 7 | 1907 |
| 8 | 5639 |
| 9 | 16967 |
| 10 | 52131 |
| 11 | 163291 |
| 12 | 518687 |
| 13 | 1659887 |
| 14 | 5320123 |
| 15 | 17004227 |
| 16 | 54054071 |
| 17 | 170674327 |
| 18 | 535082323 |
| 19 | 1666053035 |
| 20 | 5154907599 |
| 21 | 15861068351 |
| 22 | 48568847467 |
| 23 | 148122439315 |
| 24 | 450214152039 |
| 25 | 1364634624743 |
| 26 | 4127055619331 |