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 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 32 |
| 7 | 67 |
| 8 | 181 |
| 9 | 458 |
| 10 | 1295 |
| 11 | 3642 |
| 12 | 10975 |
| 13 | 33448 |
| 14 | 106424 |
| 15 | 345964 |
| 16 | 1159489 |
| 17 | 3975367 |
| 18 | 13977808 |
| 19 | 50238606 |
| 20 | 184629655 |
| 21 | 692757132 |
| 22 | 2652892219 |
| 23 | 10359676617 |
| 24 | 41233344350 |
| 25 | 167171988557 |
| 26 | 690054189750 |
| 27 | 2898637406813 |
| 28 | 12385234548345 |