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 | 3 |
| 2 | 14 |
| 3 | 52 |
| 4 | 196 |
| 5 | 733 |
| 6 | 2744 |
| 7 | 10267 |
| 8 | 38416 |
| 9 | 143739 |
| 10 | 537824 |
| 11 | 2012353 |
| 12 | 7529536 |
| 13 | 28172943 |
| 14 | 105413504 |
| 15 | 394421215 |
| 16 | 1475789056 |
| 17 | 5521897022 |
| 18 | 20661046784 |
| 19 | 77306558317 |
| 20 | 289254654976 |
| 21 | 1082291816449 |
| 22 | 4049565169664 |