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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 17 |
| 6 | 40 |
| 7 | 96 |
| 8 | 228 |
| 9 | 544 |
| 10 | 1296 |
| 11 | 3089 |
| 12 | 7361 |
| 13 | 17544 |
| 14 | 41810 |
| 15 | 99643 |
| 16 | 237471 |
| 17 | 565946 |
| 18 | 1348773 |
| 19 | 3214424 |
| 20 | 7660679 |
| 21 | 18257085 |
| 22 | 43510652 |
| 23 | 103695461 |
| 24 | 247129108 |
| 25 | 588963062 |
| 26 | 1403628615 |
| 27 | 3345155947 |
| 28 | 7972242937 |
| 29 | 18999609718 |
| 30 | 45280252031 |