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 | 28 |
| 2 | 232 |
| 3 | 1528 |
| 4 | 11792 |
| 5 | 92328 |
| 6 | 740584 |
| 7 | 6020560 |
| 8 | 49474064 |
| 9 | 409888240 |
| 10 | 3418201292 |
| 11 | 28657884404 |
| 12 | 241330103336 |
| 13 | 2039837966168 |
| 14 | 17296465194604 |
| 15 | 147063357683748 |
| 16 | 1253373089577936 |
| 17 | 10704229282080880 |
| 18 | 91584291381177844 |