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 | 3 |
| 2 | 11 |
| 3 | 48 |
| 4 | 244 |
| 5 | 1423 |
| 6 | 9415 |
| 7 | 70045 |
| 8 | 581507 |
| 9 | 5349538 |
| 10 | 54173950 |
| 11 | 600127047 |
| 12 | 7229169001 |
| 13 | 94170096335 |
| 14 | 1319764307235 |
| 15 | 19806944750672 |
| 16 | 316993980880556 |
| 17 | 5389579751775611 |
| 18 | 97018268274166055 |