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 | 5 |
| 3 | 19 |
| 4 | 75 |
| 5 | 323 |
| 6 | 1512 |
| 7 | 7630 |
| 8 | 41245 |
| 9 | 237573 |
| 10 | 1451359 |
| 11 | 9365361 |
| 12 | 63604596 |
| 13 | 453206838 |
| 14 | 3378581609 |
| 15 | 26285755211 |
| 16 | 212953670251 |
| 17 | 1792896572319 |
| 18 | 15658150745252 |
| 19 | 141619251656826 |
| 20 | 1324477898999161 |
| 21 | 12791059496663293 |
| 22 | 127395689514237279 |
| 23 | 1307010496324272157 |