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 | 2 |
| 2 | 11 |
| 3 | 88 |
| 4 | 905 |
| 5 | 11246 |
| 6 | 162607 |
| 7 | 2668436 |
| 8 | 48830273 |
| 9 | 983353690 |
| 10 | 21570885011 |
| 11 | 511212091952 |
| 12 | 13001401709881 |
| 13 | 352856328962918 |
| 14 | 10170853073795975 |
| 15 | 310093415465876716 |
| 16 | 9964607161173899777 |
| 17 | 336439048405066012466 |
| 18 | 11902368222382731461083 |
| 19 | 440122520333417057761160 |