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 | 39 |
| 4 | 123 |
| 5 | 365 |
| 6 | 1109 |
| 7 | 3393 |
| 8 | 10489 |
| 9 | 32668 |
| 10 | 102229 |
| 11 | 320988 |
| 12 | 1010194 |
| 13 | 3184136 |
| 14 | 10046919 |
| 15 | 31723590 |
| 16 | 100216743 |
| 17 | 316694003 |
| 18 | 1001003330 |
| 19 | 3164437423 |
| 20 | 10004650116 |
| 21 | 31632790242 |
| 22 | 100021566155 |
| 23 | 316274216760 |
| 24 | 1000100055682 |
| 25 | 3162493192563 |
| 26 | 10000464300849 |
| 27 | 31623776828239 |
| 28 | 100002154796112 |