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 | 3 |
| 3 | 7 |
| 4 | 23 |
| 5 | 73 |
| 6 | 281 |
| 7 | 1112 |
| 8 | 4779 |
| 9 | 21139 |
| 10 | 96793 |
| 11 | 451631 |
| 12 | 2144101 |
| 13 | 10303984 |
| 14 | 50042734 |
| 15 | 245110900 |
| 16 | 1209414659 |
| 17 | 6005130171 |
| 18 | 29983077169 |
| 19 | 150437143336 |
| 20 | 758110844897 |
| 21 | 3835445581758 |
| 22 | 19473373629628 |
| 23 | 99189996107004 |
| 24 | 506726776334889 |
| 25 | 2595687705113097 |