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 | 17 |
| 2 | 153 |
| 3 | 969 |
| 4 | 4845 |
| 5 | 20349 |
| 6 | 74613 |
| 7 | 245157 |
| 8 | 735471 |
| 9 | 2031535 |
| 10 | 5189327 |
| 11 | 12316239 |
| 12 | 27322191 |
| 13 | 57029103 |
| 14 | 112740255 |
| 15 | 212383935 |
| 16 | 383358645 |
| 17 | 666220005 |
| 18 | 1119362365 |
| 19 | 1824861005 |
| 20 | 2895653673 |
| 21 | 4484253081 |
| 22 | 6793194849 |
| 23 | 10087438257 |
| 24 | 14708950035 |
| 25 | 21093714291 |