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 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 25 |
| 5 | 57 |
| 6 | 129 |
| 7 | 293 |
| 8 | 665 |
| 9 | 1509 |
| 10 | 3425 |
| 11 | 7773 |
| 12 | 17641 |
| 13 | 40037 |
| 14 | 90865 |
| 15 | 206221 |
| 16 | 468025 |
| 17 | 1062197 |
| 18 | 2410689 |
| 19 | 5471133 |
| 20 | 12416905 |
| 21 | 28180549 |
| 22 | 63956625 |
| 23 | 145151533 |
| 24 | 329425881 |
| 25 | 747642197 |
| 26 | 1696797025 |
| 27 | 3850933181 |
| 28 | 8739811625 |
| 29 | 19835272037 |
| 30 | 45016761649 |