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 | 4 |
| 3 | 22 |
| 4 | 124 |
| 5 | 706 |
| 6 | 4036 |
| 7 | 23110 |
| 8 | 132412 |
| 9 | 758866 |
| 10 | 4349572 |
| 11 | 24931318 |
| 12 | 142906108 |
| 13 | 819141730 |
| 14 | 4695354436 |
| 15 | 26913992998 |
| 16 | 154272336316 |
| 17 | 884296781554 |
| 18 | 5068833880324 |
| 19 | 29054812882390 |
| 20 | 166543662614908 |
| 21 | 954636733448194 |
| 22 | 5472026253591748 |
| 23 | 31365932493907462 |