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) |
|---|---|
| 1 | 0 |
| 2 | 15 |
| 3 | 74 |
| 4 | 411 |
| 5 | 2447 |
| 6 | 16386 |
| 7 | 117207 |
| 8 | 879908 |
| 9 | 6849047 |
| 10 | 54818296 |
| 11 | 448725003 |
| 12 | 3741217498 |