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 | 5 |
| 2 | 13 |
| 3 | 35 |
| 4 | 91 |
| 5 | 239 |
| 6 | 625 |
| 7 | 1637 |
| 8 | 4285 |
| 9 | 11219 |
| 10 | 29371 |
| 11 | 76895 |
| 12 | 201313 |
| 13 | 527045 |
| 14 | 1379821 |
| 15 | 3612419 |
| 16 | 9457435 |
| 17 | 24759887 |
| 18 | 64822225 |
| 19 | 169706789 |
| 20 | 444298141 |
| 21 | 1163187635 |
| 22 | 3045264763 |
| 23 | 7972606655 |
| 24 | 20872555201 |
| 25 | 54645058949 |
| 26 | 143062621645 |
| 27 | 374542805987 |
| 28 | 980565796315 |