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 | 4 |
| 3 | 8 |
| 4 | 14 |
| 5 | 20 |
| 6 | 38 |
| 7 | 70 |
| 8 | 134 |
| 9 | 240 |
| 10 | 442 |
| 11 | 814 |
| 12 | 1502 |
| 13 | 2756 |
| 14 | 5070 |
| 15 | 9326 |
| 16 | 17158 |
| 17 | 31552 |
| 18 | 58034 |
| 19 | 106742 |
| 20 | 196334 |
| 21 | 361108 |
| 22 | 664182 |
| 23 | 1221622 |
| 24 | 2246918 |
| 25 | 4132720 |
| 26 | 7601258 |
| 27 | 13980894 |
| 28 | 25714878 |
| 29 | 47297028 |
| 30 | 86992798 |