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 | 0 |
| 2 | 5 |
| 3 | 17 |
| 4 | 59 |
| 5 | 169 |
| 6 | 475 |
| 7 | 1287 |
| 8 | 3449 |
| 9 | 9149 |
| 10 | 24155 |
| 11 | 63557 |
| 12 | 166919 |
| 13 | 437839 |
| 14 | 1147645 |
| 15 | 3006777 |
| 16 | 7875419 |
| 17 | 20623889 |
| 18 | 54003395 |
| 19 | 141397847 |
| 20 | 370208849 |
| 21 | 969258949 |
| 22 | 2537616955 |
| 23 | 6643671117 |
| 24 | 17393524559 |
| 25 | 45537109919 |
| 26 | 119218140725 |