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 | 2 |
| 3 | 3 |
| 4 | 15 |
| 5 | 31 |
| 6 | 65 |
| 7 | 153 |
| 8 | 343 |
| 9 | 775 |
| 10 | 1729 |
| 11 | 3735 |
| 12 | 8175 |
| 13 | 17371 |
| 14 | 36447 |
| 15 | 76077 |
| 16 | 157471 |
| 17 | 324801 |
| 18 | 669469 |
| 19 | 1370903 |
| 20 | 2807215 |
| 21 | 5728545 |
| 22 | 11679949 |
| 23 | 23777059 |
| 24 | 48348375 |
| 25 | 98093505 |