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 | 2 |
| 2 | 7 |
| 3 | 20 |
| 4 | 57 |
| 5 | 157 |
| 6 | 432 |
| 7 | 1189 |
| 8 | 3270 |
| 9 | 8994 |
| 10 | 24735 |
| 11 | 68023 |
| 12 | 187064 |
| 13 | 514428 |
| 14 | 1414678 |
| 15 | 3890365 |
| 16 | 10698505 |
| 17 | 29420889 |
| 18 | 80907445 |
| 19 | 222495474 |
| 20 | 611862556 |
| 21 | 1682622029 |
| 22 | 4627210579 |
| 23 | 12724829094 |
| 24 | 34993280009 |
| 25 | 96231520027 |
| 26 | 264636680074 |