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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 18 |
| 6 | 44 |
| 7 | 98 |
| 8 | 244 |
| 9 | 605 |
| 10 | 1595 |
| 11 | 4273 |
| 12 | 12048 |
| 13 | 34790 |
| 14 | 104480 |
| 15 | 322954 |
| 16 | 1031556 |
| 17 | 3389413 |
| 18 | 11464454 |
| 19 | 39820812 |
| 20 | 141962355 |
| 21 | 518663683 |
| 22 | 1940341269 |
| 23 | 7424565391 |
| 24 | 29033121685 |
| 25 | 115921101414 |
| 26 | 472219204088 |
| 27 | 1961177127371 |
| 28 | 8298334192288 |
| 29 | 35751364047676 |
| 30 | 156736154469354 |