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 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 36 |
| 6 | 79 |
| 7 | 195 |
| 8 | 477 |
| 9 | 1209 |
| 10 | 3168 |
| 11 | 8415 |
| 12 | 22806 |
| 13 | 62412 |
| 14 | 172887 |
| 15 | 481552 |
| 16 | 1351485 |
| 17 | 3808080 |
| 18 | 10780653 |
| 19 | 30615351 |
| 20 | 87226932 |
| 21 | 249144506 |
| 22 | 713378655 |
| 23 | 2046856563 |
| 24 | 5884468110 |
| 25 | 16946569332 |
| 26 | 48883597728 |
| 27 | 141217159239 |