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 | 3 |
| 1 | 7 |
| 2 | 23 |
| 3 | 47 |
| 4 | 1103 |
| 5 | 2207 |
| 6 | 2435423 |
| 7 | 4870847 |
| 8 | 11862575248703 |
| 9 | 23725150497407 |
| 10 | 281441383062305809756861823 |
| 11 | 562882766124611619513723647 |
| 12 | 158418504200047111075388369241884118003210485743490303 |