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 | 55 |
| 2 | 12559 |
| 3 | 3685123 |
| 4 | 1205189519 |
| 5 | 418856591055 |
| 6 | 151353475289275 |
| 7 | 56193989426243199 |
| 8 | 21283943385478109071 |
| 9 | 8185785098679048061837 |
| 10 | 3186604888590691870779559 |
| 11 | 1252744279186835597251089055 |
| 12 | 496508748101370063304243706939 |
| 13 | 198134918989716743103591120933103 |