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 | 1 |
| 4 | 1 |
| 5 | 5 |
| 6 | 88 |
| 7 | 571 |
| 8 | 3719 |
| 9 | 32608 |
| 10 | 229978 |
| 11 | 1944146 |
| 12 | 12785619 |
| 13 | 92175303 |
| 14 | 562796025 |
| 15 | 3586783831 |
| 16 | 21282332690 |
| 17 | 123857108265 |
| 18 | 711033477793 |
| 19 | 3887110307164 |
| 20 | 21647422702326 |
| 21 | 114426238905952 |
| 22 | 619561557445710 |