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) |
|---|---|
| 2 | 3 |
| 3 | 23 |
| 4 | 63 |
| 5 | 127 |
| 6 | 273 |
| 7 | 583 |
| 8 | 1287 |
| 9 | 2975 |
| 10 | 6993 |
| 11 | 16535 |
| 12 | 39525 |
| 13 | 95071 |
| 14 | 229029 |
| 15 | 552199 |
| 16 | 1332375 |
| 17 | 3215807 |
| 18 | 7762611 |
| 19 | 18739607 |
| 20 | 45240309 |
| 21 | 109217983 |
| 22 | 263673699 |
| 23 | 636563527 |
| 24 | 1536798717 |
| 25 | 3710157407 |
| 26 | 8957109801 |
| 27 | 21624374039 |
| 28 | 52205854257 |
| 29 | 126036078751 |
| 30 | 304278008331 |
| 31 | 734592089095 |