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 | 5 |
| 3 | 15 |
| 4 | 41 |
| 5 | 107 |
| 6 | 273 |
| 7 | 707 |
| 8 | 1817 |
| 9 | 4617 |
| 10 | 11867 |
| 11 | 30425 |
| 12 | 76857 |
| 13 | 197603 |
| 14 | 505871 |
| 15 | 1275465 |
| 16 | 3276563 |
| 17 | 8406527 |
| 18 | 21165273 |
| 19 | 54338627 |
| 20 | 139513379 |
| 21 | 351447657 |
| 22 | 901789811 |
| 23 | 2304725075 |
| 24 | 5840498937 |
| 25 | 14978318243 |
| 26 | 38107010435 |
| 27 | 97141424265 |
| 28 | 248995117523 |
| 29 | 630641012147 |