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 | 4 |
| 2 | 16 |
| 3 | 52 |
| 4 | 157 |
| 5 | 434 |
| 6 | 1144 |
| 7 | 2862 |
| 8 | 6906 |
| 9 | 16090 |
| 10 | 36449 |
| 11 | 80430 |
| 12 | 173555 |
| 13 | 366802 |
| 14 | 761102 |
| 15 | 1552569 |
| 16 | 3118508 |
| 17 | 6174461 |
| 18 | 12064383 |
| 19 | 23283027 |
| 20 | 44419855 |
| 21 | 83834278 |
| 22 | 156626605 |
| 23 | 289839251 |
| 24 | 531534746 |
| 25 | 966483534 |
| 26 | 1743164649 |
| 27 | 3119864511 |
| 28 | 5543030861 |
| 29 | 9779552117 |
| 30 | 17139055493 |