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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 11 |
| 4 | 35 |
| 5 | 93 |
| 6 | 269 |
| 7 | 747 |
| 8 | 2115 |
| 9 | 5933 |
| 10 | 16717 |
| 11 | 47003 |
| 12 | 132291 |
| 13 | 372157 |
| 14 | 1047181 |
| 15 | 2946251 |
| 16 | 8289731 |
| 17 | 23323853 |
| 18 | 65624397 |
| 19 | 184640891 |
| 20 | 519507267 |
| 21 | 1461688413 |
| 22 | 4112616845 |
| 23 | 11571284395 |
| 24 | 32557042499 |
| 25 | 91602704493 |
| 26 | 257733967693 |
| 27 | 725161963867 |