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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 18 |
| 5 | 67 |
| 6 | 374 |
| 7 | 2063 |
| 8 | 12482 |
| 9 | 76835 |
| 10 | 486375 |
| 11 | 3119695 |
| 12 | 20275051 |
| 13 | 133031450 |
| 14 | 880300617 |
| 15 | 5866722906 |