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 | 3 |
| 3 | 6 |
| 4 | 25 |
| 5 | 104 |
| 6 | 634 |
| 7 | 1236 |
| 8 | 22613 |
| 9 | 103409 |
| 10 | 929044 |
| 11 | 6298419 |
| 12 | 80396036 |
| 13 | 843325558 |
| 14 | 5843115733 |
| 15 | 24428345613 |
| 16 | 515211289906 |
| 17 | 4021634909249 |
| 18 | 77930896716918 |
| 19 | 387592118891917 |
| 20 | 53467625139656294 |
| 21 | 258820291307490689 |
| 22 | 2600667638804262010 |
| 23 | 29899374277934530878 |