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 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 46 |
| 4 | 737 |
| 5 | 18426 |
| 6 | 663337 |
| 7 | 32503514 |
| 8 | 2080224897 |
| 9 | 168498216658 |
| 10 | 16849821665801 |
| 11 | 2038828421561922 |
| 12 | 293591292704916769 |
| 13 | 49616928467130933962 |
| 14 | 9724917979557663056553 |
| 15 | 2188106545400474187724426 |