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 | 10 |
| 3 | 43 |
| 4 | 140 |
| 5 | 494 |
| 6 | 1845 |
| 7 | 6757 |
| 8 | 24479 |
| 9 | 89068 |
| 10 | 324765 |
| 11 | 1182996 |
| 12 | 4307440 |
| 13 | 15687513 |
| 14 | 57137761 |
| 15 | 208098949 |
| 16 | 757896766 |
| 17 | 2760293603 |
| 18 | 10053139616 |
| 19 | 36613986582 |
| 20 | 133349718469 |
| 21 | 485665707449 |
| 22 | 1768816633099 |
| 23 | 6442109942616 |
| 24 | 23462454583677 |