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 | 315 |
| 3 | 151669 |
| 4 | 73103983 |
| 5 | 35235967977 |
| 6 | 16983663460771 |
| 7 | 8186090552123485 |
| 8 | 3945678662460058839 |
| 9 | 1901808929215196236753 |
| 10 | 916667958203062126055947 |
| 11 | 441832054044946729562729541 |
| 12 | 212962133381706120587109582655 |
| 13 | 102647306457928305176257256110009 |