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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 41 |
| 6 | 97 |
| 7 | 225 |
| 8 | 513 |
| 9 | 1153 |
| 10 | 2561 |
| 11 | 5633 |
| 12 | 12289 |
| 13 | 26625 |
| 14 | 57345 |
| 15 | 122881 |
| 16 | 262145 |
| 17 | 557057 |
| 18 | 1179649 |
| 19 | 2490369 |
| 20 | 5242881 |
| 21 | 11010049 |
| 22 | 23068673 |
| 23 | 48234497 |
| 24 | 100663297 |
| 25 | 209715201 |
| 26 | 436207617 |
| 27 | 905969665 |