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 | 129 |
| 2 | 2945 |
| 3 | 29953 |
| 4 | 187137 |
| 5 | 845185 |
| 6 | 3032705 |
| 7 | 9173505 |
| 8 | 24331777 |
| 9 | 58161793 |
| 10 | 127791489 |
| 11 | 261902081 |
| 12 | 506298625 |
| 13 | 931299201 |
| 14 | 1641303169 |
| 15 | 2786931713 |
| 16 | 4580166657 |
| 17 | 7312946305 |
| 18 | 11379709825 |
| 19 | 17304414465 |
| 20 | 25772582657 |
| 21 | 37668968833 |
| 22 | 54121468545 |
| 23 | 76551925249 |