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 | 3 |
| 3 | 9 |
| 4 | 37 |
| 5 | 182 |
| 6 | 1143 |
| 7 | 7553 |
| 8 | 54559 |
| 9 | 412306 |
| 10 | 3251240 |
| 11 | 26478264 |
| 12 | 221714164 |
| 13 | 1900103364 |
| 14 | 16613990484 |
| 15 | 147816411921 |
| 16 | 1335367515821 |