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 | 10 |
| 3 | 29 |
| 4 | 76 |
| 5 | 187 |
| 6 | 442 |
| 7 | 1017 |
| 8 | 2296 |
| 9 | 5111 |
| 10 | 11254 |
| 11 | 24565 |
| 12 | 53236 |
| 13 | 114675 |
| 14 | 245746 |
| 15 | 524273 |
| 16 | 1114096 |
| 17 | 2359279 |
| 18 | 4980718 |
| 19 | 10485741 |
| 20 | 22020076 |
| 21 | 46137323 |
| 22 | 96468970 |
| 23 | 201326569 |
| 24 | 419430376 |
| 25 | 872415207 |
| 26 | 1811939302 |
| 27 | 3758096357 |
| 28 | 7784628196 |
| 29 | 16106127331 |
| 30 | 33285996514 |