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 | 5 |
| 2 | 9 |
| 3 | 16 |
| 4 | 35 |
| 5 | 78 |
| 6 | 210 |
| 7 | 551 |
| 8 | 1569 |
| 9 | 4475 |
| 10 | 13078 |
| 11 | 38465 |
| 12 | 114584 |
| 13 | 343026 |
| 14 | 1034471 |
| 15 | 3134135 |
| 16 | 9540969 |
| 17 | 29154478 |
| 18 | 89407073 |
| 19 | 275016292 |
| 20 | 848329872 |
| 21 | 2623322133 |
| 22 | 8130714643 |
| 23 | 25252366057 |
| 24 | 78577560856 |
| 25 | 244933963301 |
| 26 | 764707458720 |
| 27 | 2391026407058 |
| 28 | 7486342546939 |