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 | 7 |
| 2 | 7 |
| 3 | 39 |
| 4 | 115 |
| 5 | 343 |
| 6 | 967 |
| 7 | 2663 |
| 8 | 7203 |
| 9 | 19239 |
| 10 | 50887 |
| 11 | 133543 |
| 12 | 348179 |
| 13 | 902775 |
| 14 | 2329607 |
| 15 | 5986535 |
| 16 | 15327555 |
| 17 | 39115847 |
| 18 | 99532423 |
| 19 | 252601127 |
| 20 | 639548595 |
| 21 | 1615746455 |
| 22 | 4073951559 |
| 23 | 10253517671 |
| 24 | 25763632995 |
| 25 | 64635943783 |
| 26 | 161928486727 |
| 27 | 405134009511 |
| 28 | 1012371656275 |