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 | 9 |
| 2 | 26 |
| 3 | 62 |
| 4 | 138 |
| 5 | 298 |
| 6 | 634 |
| 7 | 1338 |
| 8 | 2810 |
| 9 | 5882 |
| 10 | 12282 |
| 11 | 25594 |
| 12 | 53242 |
| 13 | 110586 |
| 14 | 229370 |
| 15 | 475130 |
| 16 | 983034 |
| 17 | 2031610 |
| 18 | 4194298 |
| 19 | 8650746 |
| 20 | 17825786 |
| 21 | 36700154 |
| 22 | 75497466 |
| 23 | 155189242 |
| 24 | 318767098 |
| 25 | 654311418 |
| 26 | 1342177274 |
| 27 | 2751463418 |
| 28 | 5637144570 |
| 29 | 11542724602 |
| 30 | 23622320122 |