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 | 6 |
| 2 | 24 |
| 3 | 82 |
| 4 | 261 |
| 5 | 804 |
| 6 | 2440 |
| 7 | 7356 |
| 8 | 22113 |
| 9 | 66394 |
| 10 | 199248 |
| 11 | 597822 |
| 12 | 1793557 |
| 13 | 5380776 |
| 14 | 16142448 |
| 15 | 48427480 |
| 16 | 145282593 |
| 17 | 435847950 |
| 18 | 1307544040 |
| 19 | 3922632330 |
| 20 | 11767897221 |
| 21 | 35303691916 |
| 22 | 105911076024 |
| 23 | 317733228372 |
| 24 | 953199685441 |