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 | 3 |
| 2 | 7 |
| 3 | 16 |
| 4 | 35 |
| 5 | 78 |
| 6 | 171 |
| 7 | 383 |
| 8 | 849 |
| 9 | 1919 |
| 10 | 4301 |
| 11 | 9807 |
| 12 | 22193 |
| 13 | 50993 |
| 14 | 116349 |
| 15 | 269094 |
| 16 | 618277 |
| 17 | 1437916 |
| 18 | 3323277 |
| 19 | 7764996 |
| 20 | 18035275 |
| 21 | 42304904 |
| 22 | 98668223 |
| 23 | 232198092 |
| 24 | 543453693 |
| 25 | 1282401208 |
| 26 | 3010275001 |
| 27 | 7119589730 |
| 28 | 16753996391 |