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 | 10 |
| 3 | 47 |
| 4 | 158 |
| 5 | 441 |
| 6 | 1098 |
| 7 | 2539 |
| 8 | 5590 |
| 9 | 11909 |
| 10 | 24818 |
| 11 | 50967 |
| 12 | 103662 |
| 13 | 209521 |
| 14 | 421786 |
| 15 | 846947 |
| 16 | 1697990 |
| 17 | 3400893 |
| 18 | 6807618 |
| 19 | 13622095 |
| 20 | 27252190 |
| 21 | 54513641 |
| 22 | 109037930 |
| 23 | 218088027 |
| 24 | 436189878 |
| 25 | 872395381 |
| 26 | 1744808338 |
| 27 | 3489636359 |