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 | 14 |
| 2 | 141 |
| 3 | 1246 |
| 4 | 10277 |
| 5 | 81270 |
| 6 | 624877 |
| 7 | 4710062 |
| 8 | 34985973 |
| 9 | 256995046 |
| 10 | 1871524733 |
| 11 | 13536029598 |
| 12 | 97364345989 |
| 13 | 697223254742 |
| 14 | 4974599780109 |
| 15 | 35386420442254 |
| 16 | 251090274984725 |
| 17 | 1777943916226758 |
| 18 | 12567479361589405 |
| 19 | 88703587219138430 |
| 20 | 625312500662044581 |