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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 11 |
| 4 | 28 |
| 5 | 68 |
| 6 | 169 |
| 7 | 422 |
| 8 | 1048 |
| 9 | 2603 |
| 10 | 6472 |
| 11 | 16088 |
| 12 | 39985 |
| 13 | 99386 |
| 14 | 247036 |
| 15 | 614027 |
| 16 | 1526212 |
| 17 | 3793532 |
| 18 | 9429145 |
| 19 | 23436926 |
| 20 | 58254448 |
| 21 | 144796331 |
| 22 | 359903440 |
| 23 | 894570224 |
| 24 | 2223529441 |
| 25 | 5526769202 |
| 26 | 13737249076 |
| 27 | 34145086475 |
| 28 | 84870480556 |