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 | 5 |
| 2 | 19 |
| 3 | 62 |
| 4 | 193 |
| 5 | 587 |
| 6 | 1771 |
| 7 | 5324 |
| 8 | 15985 |
| 9 | 47969 |
| 10 | 143923 |
| 11 | 431786 |
| 12 | 1295377 |
| 13 | 3886151 |
| 14 | 11658475 |
| 15 | 34975448 |
| 16 | 104926369 |
| 17 | 314779133 |
| 18 | 944337427 |
| 19 | 2833012310 |
| 20 | 8499036961 |
| 21 | 25497110915 |
| 22 | 76491332779 |
| 23 | 229473998372 |
| 24 | 688421995153 |
| 25 | 2065265985497 |
| 26 | 6195797956531 |
| 27 | 18587393869634 |