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 | 2 |
| 2 | 5 |
| 3 | 18 |
| 4 | 87 |
| 5 | 462 |
| 6 | 2635 |
| 7 | 16870 |
| 8 | 118969 |
| 9 | 915442 |
| 10 | 7535369 |
| 11 | 66807234 |
| 12 | 633443407 |
| 13 | 6354135838 |
| 14 | 67480769839 |
| 15 | 754734433310 |
| 16 | 8870886701401 |