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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 35 |
| 5 | 126 |
| 6 | 462 |
| 7 | 1716 |
| 8 | 6435 |
| 9 | 24310 |
| 10 | 92378 |
| 11 | 352705 |
| 12 | 1351934 |
| 13 | 5199117 |
| 14 | 20050460 |
| 15 | 77512860 |
| 16 | 300292131 |
| 17 | 1165534689 |
| 18 | 4531337778 |
| 19 | 17642948675 |
| 20 | 68785126410 |
| 21 | 268497991905 |
| 22 | 1049210943531 |
| 23 | 4104103226699 |
| 24 | 16068342973950 |
| 25 | 62963565243876 |
| 26 | 246913415221671 |