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 | 33 |
| 5 | 87 |
| 6 | 259 |
| 7 | 730 |
| 8 | 2150 |
| 9 | 6278 |
| 10 | 18622 |
| 11 | 55340 |
| 12 | 165857 |
| 13 | 498907 |
| 14 | 1509012 |
| 15 | 4581570 |
| 16 | 13967031 |
| 17 | 42722777 |
| 18 | 131110259 |
| 19 | 403527667 |
| 20 | 1245358416 |
| 21 | 3852965298 |
| 22 | 11948207174 |
| 23 | 37131355170 |
| 24 | 115623660978 |
| 25 | 360712069084 |
| 26 | 1127276560366 |