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 | 3 |
| 3 | 11 |
| 4 | 42 |
| 5 | 162 |
| 6 | 626 |
| 7 | 2419 |
| 8 | 9346 |
| 9 | 36106 |
| 10 | 139483 |
| 11 | 538841 |
| 12 | 2081612 |
| 13 | 8041537 |
| 14 | 31065506 |
| 15 | 120010109 |
| 16 | 463614741 |
| 17 | 1791004361 |
| 18 | 6918884013 |
| 19 | 26728553546 |
| 20 | 103255896932 |
| 21 | 398891029862 |
| 22 | 1540968200661 |
| 23 | 5952961630324 |
| 24 | 22997069087436 |