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 | 1 |
| 2 | 4098 |
| 3 | 539636 |
| 4 | 17852390 |
| 5 | 279305769 |
| 6 | 2717541484 |
| 7 | 18997064400 |
| 8 | 103996064052 |
| 9 | 471424600185 |
| 10 | 1838853136318 |
| 11 | 6344710049172 |
| 12 | 19766667410282 |
| 13 | 56486709893873 |
| 14 | 149900664752760 |
| 15 | 373060957502272 |
| 16 | 877696226962440 |
| 17 | 1964953733652369 |
| 18 | 4209042621768474 |
| 19 | 8666446428950740 |
| 20 | 17219850236133006 |
| 21 | 33129081554701913 |
| 22 | 61893315504320036 |