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 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 37 |
| 6 | 108 |
| 7 | 325 |
| 8 | 993 |
| 9 | 3070 |
| 10 | 9564 |
| 11 | 29979 |
| 12 | 94392 |
| 13 | 298311 |
| 14 | 945592 |
| 15 | 3005021 |
| 16 | 9570559 |
| 17 | 30539044 |
| 18 | 97611676 |
| 19 | 312462096 |
| 20 | 1001554565 |
| 21 | 3214232129 |
| 22 | 10326580526 |
| 23 | 33210135104 |
| 24 | 106901289420 |
| 25 | 344398593149 |
| 26 | 1110395171502 |
| 27 | 3582666470285 |
| 28 | 11567123373968 |