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 | 41 |
| 2 | 53 |
| 3 | 101 |
| 4 | 293 |
| 5 | 1061 |
| 6 | 4133 |
| 7 | 16421 |
| 8 | 1048613 |
| 9 | 268435493 |
| 10 | 4503599627370533 |
| 11 | 18446744073709551653 |
| 12 | 18889465931478580854821 |
| 13 | 316912650057057350374175801381 |
| 14 | 1393796574908163946345982392040522594123813 |
| 15 | 23945242826029513411849172299223580994042798784118821 |