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 | 4 |
| 3 | 16 |
| 4 | 79 |
| 5 | 319 |
| 6 | 1576 |
| 7 | 6364 |
| 8 | 31441 |
| 9 | 126961 |
| 10 | 627244 |
| 11 | 2532856 |
| 12 | 12513439 |
| 13 | 50530159 |
| 14 | 249641536 |
| 15 | 1008070324 |
| 16 | 4980317281 |
| 17 | 20110876321 |
| 18 | 99356704084 |
| 19 | 401209456096 |
| 20 | 1982153764399 |
| 21 | 8004078245599 |
| 22 | 39543718583896 |
| 23 | 159680355455884 |
| 24 | 788892217913521 |