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 | 8193 |
| 2 | 1602515 |
| 3 | 68703187 |
| 4 | 1287811989 |
| 5 | 14281397141 |
| 6 | 109949704423 |
| 7 | 646644824295 |
| 8 | 3091621642217 |
| 9 | 12541865828329 |
| 10 | 44522712143931 |
| 11 | 141515917523003 |
| 12 | 409868311971325 |
| 13 | 1096589879846397 |
| 14 | 2739909841613519 |