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 | 4 |
| 2 | 15 |
| 3 | 110 |
| 4 | 1319 |
| 5 | 21626 |
| 6 | 440406 |
| 7 | 10567338 |
| 8 | 289567071 |
| 9 | 8881182506 |
| 10 | 300677809182 |
| 11 | 11123151634732 |
| 12 | 446124758009229 |
| 13 | 19278179994562787 |
| 14 | 892894885467043254 |
| 15 | 44130236756271133940 |
| 16 | 2318466084626196805383 |
| 17 | 129037338117765390406606 |
| 18 | 7585054768393048247917776 |
| 19 | 469612308887467564648834414 |