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 | 4 |
| 3 | 8 |
| 4 | 39 |
| 5 | 122 |
| 6 | 950 |
| 7 | 5042 |
| 8 | 45594 |
| 9 | 366243 |
| 10 | 3858148 |
| 11 | 39916802 |
| 12 | 494852628 |
| 13 | 6227020802 |
| 14 | 88543569808 |
| 15 | 1308012219556 |
| 16 | 21086562956045 |
| 17 | 355687428096002 |
| 18 | 6427672041650478 |
| 19 | 121645100408832002 |
| 20 | 2437655776358606198 |
| 21 | 51091307191310604724 |
| 22 | 1125098543553717372868 |
| 23 | 25852016738884976640002 |
| 24 | 620752122372339473623314 |
| 25 | 15511210044577707470250243 |