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 | 8 |
| 2 | 44 |
| 3 | 208 |
| 4 | 854 |
| 5 | 3200 |
| 6 | 11176 |
| 7 | 36752 |
| 8 | 115089 |
| 9 | 345600 |
| 10 | 1000484 |
| 11 | 2804544 |
| 12 | 7639718 |
| 13 | 20280672 |
| 14 | 52593032 |
| 15 | 133509840 |
| 16 | 332340788 |
| 17 | 812455304 |
| 18 | 1953140484 |
| 19 | 4622589504 |
| 20 | 10782030284 |
| 21 | 24807035200 |
| 22 | 56345836888 |
| 23 | 126438750160 |
| 24 | 280490520517 |
| 25 | 615512622608 |
| 26 | 1336825948592 |
| 27 | 2875079590304 |