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 | 4 |
| 2 | 13 |
| 3 | 35 |
| 4 | 103 |
| 5 | 278 |
| 6 | 763 |
| 7 | 2037 |
| 8 | 5421 |
| 9 | 14264 |
| 10 | 37321 |
| 11 | 97015 |
| 12 | 250963 |
| 13 | 646250 |
| 14 | 1657719 |
| 15 | 4237481 |
| 16 | 10798553 |
| 17 | 27442092 |
| 18 | 69563653 |
| 19 | 175938699 |
| 20 | 444060607 |
| 21 | 1118668286 |
| 22 | 2813233523 |
| 23 | 7063416349 |
| 24 | 17708464645 |
| 25 | 44335423456 |
| 26 | 110857865665 |
| 27 | 276863340767 |