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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 14 |
| 7 | 66 |
| 8 | 95 |
| 9 | 280 |
| 10 | 1464 |
| 11 | 2694 |
| 12 | 10452 |
| 13 | 41410 |
| 14 | 95640 |
| 15 | 323396 |
| 16 | 1770963 |
| 17 | 5405026 |
| 18 | 13269146 |
| 19 | 73663402 |
| 20 | 164107650 |
| 21 | 582538732 |
| 22 | 3811895344 |
| 23 | 7457847082 |
| 24 | 30712068524 |
| 25 | 151938788640 |
| 26 | 353218528324 |
| 27 | 1738341231644 |
| 28 | 7326366290632 |
| 29 | 17280039555348 |
| 30 | 63583110959728 |