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 | 79 |
| 2 | 3081 |
| 3 | 79079 |
| 4 | 1502501 |
| 5 | 22537515 |
| 6 | 277962685 |
| 7 | 2898753715 |
| 8 | 26088783435 |
| 9 | 205811513765 |
| 10 | 1440680596355 |
| 11 | 9036996468045 |
| 12 | 51209646652255 |
| 13 | 263926640438545 |
| 14 | 1244225590638855 |
| 15 | 5391644226101705 |
| 16 | 21566576904406820 |
| 17 | 79923196763389980 |
| 18 | 275291011073898820 |