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 | 11 |
| 4 | 34 |
| 5 | 93 |
| 6 | 269 |
| 7 | 735 |
| 8 | 2037 |
| 9 | 5515 |
| 10 | 14912 |
| 11 | 39828 |
| 12 | 105931 |
| 13 | 279408 |
| 14 | 733409 |
| 15 | 1913349 |
| 16 | 4968092 |
| 17 | 12835746 |
| 18 | 33020764 |
| 19 | 84586922 |
| 20 | 215844162 |
| 21 | 548725545 |
| 22 | 1390140594 |
| 23 | 3510064528 |
| 24 | 8834980324 |
| 25 | 22171254453 |
| 26 | 55479601543 |
| 27 | 138448505906 |
| 28 | 344594242788 |
| 29 | 855538158016 |