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 | 37 |
| 3 | 257 |
| 4 | 1801 |
| 5 | 12605 |
| 6 | 88237 |
| 7 | 617657 |
| 8 | 4323601 |
| 9 | 30265205 |
| 10 | 211856437 |
| 11 | 1482995057 |
| 12 | 10380965401 |
| 13 | 72666757805 |
| 14 | 508667304637 |
| 15 | 3560671132457 |
| 16 | 24924697927201 |
| 17 | 174472885490405 |
| 18 | 1221310198432837 |
| 19 | 8549171389029857 |