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 | 6 |
| 5 | 22 |
| 6 | 92 |
| 7 | 425 |
| 8 | 2119 |
| 9 | 11184 |
| 10 | 61499 |
| 11 | 347980 |
| 12 | 2007643 |
| 13 | 11734604 |
| 14 | 69181578 |
| 15 | 410179429 |
| 16 | 2441025998 |
| 17 | 14562284120 |
| 18 | 87012222100 |
| 19 | 520458020949 |
| 20 | 3115224471290 |
| 21 | 18654716694895 |
| 22 | 111741999352603 |
| 23 | 669466118302169 |