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 | 4 |
| 2 | 5 |
| 3 | 14 |
| 4 | 159 |
| 5 | 491 |
| 6 | 2614 |
| 7 | 3105 |
| 8 | 33664 |
| 9 | 36769 |
| 10 | 107202 |
| 11 | 572779 |
| 12 | 1825539 |
| 13 | 9700474 |
| 14 | 11526013 |
| 15 | 32752500 |
| 16 | 142536013 |
| 17 | 175288513 |
| 18 | 317824526 |
| 19 | 810937565 |
| 20 | 3561574786 |
| 21 | 182451251651 |
| 22 | 186012826437 |
| 23 | 926502557399 |
| 24 | 2039017941235 |
| 25 | 5004538439869 |
| 26 | 157179709577174 |