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 | 19 |
| 2 | 154 |
| 3 | 814 |
| 4 | 3289 |
| 5 | 11011 |
| 6 | 32032 |
| 7 | 83512 |
| 8 | 199342 |
| 9 | 442442 |
| 10 | 923780 |
| 11 | 1830764 |
| 12 | 3468374 |
| 13 | 6317234 |
| 14 | 11113784 |
| 15 | 18958808 |
| 16 | 31461815 |
| 17 | 50930165 |
| 18 | 80613390 |
| 19 | 125014890 |
| 20 | 190285095 |
| 21 | 284712285 |
| 22 | 419329560 |
| 23 | 608658960 |
| 24 | 871616460 |
| 25 | 1232604516 |
| 26 | 1722822024 |
| 27 | 2381824984 |