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) |
|---|---|
| 2 | 10 |
| 3 | 34 |
| 4 | 106 |
| 5 | 344 |
| 6 | 1102 |
| 7 | 3546 |
| 8 | 11394 |
| 9 | 36628 |
| 10 | 117730 |
| 11 | 378426 |
| 12 | 1216378 |
| 13 | 3909832 |
| 14 | 12567446 |
| 15 | 40395794 |
| 16 | 129844994 |
| 17 | 417363332 |
| 18 | 1341539194 |
| 19 | 4312135922 |
| 20 | 13860583626 |
| 21 | 44552347608 |
| 22 | 143205490526 |
| 23 | 460308235562 |
| 24 | 1479577849602 |
| 25 | 4755836293844 |
| 26 | 15286778495570 |
| 27 | 49136593930954 |