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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 49 |
| 7 | 118 |
| 8 | 300 |
| 9 | 765 |
| 10 | 1998 |
| 11 | 5255 |
| 12 | 14027 |
| 13 | 37670 |
| 14 | 102095 |
| 15 | 278262 |
| 16 | 763022 |
| 17 | 2101905 |
| 18 | 5816142 |
| 19 | 16153148 |
| 20 | 45017423 |
| 21 | 125836711 |
| 22 | 352723949 |
| 23 | 991143727 |
| 24 | 2791422887 |
| 25 | 7877935985 |
| 26 | 22275473767 |
| 27 | 63096075118 |
| 28 | 179012076933 |