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 | 18 |
| 5 | 51 |
| 6 | 161 |
| 7 | 560 |
| 8 | 2123 |
| 9 | 8691 |
| 10 | 38142 |
| 11 | 178407 |
| 12 | 885041 |
| 13 | 4636948 |
| 14 | 25564727 |
| 15 | 147848651 |
| 16 | 894448186 |
| 17 | 5646589363 |
| 18 | 37115577265 |
| 19 | 253517232120 |
| 20 | 1796241061843 |
| 21 | 13180234725987 |
| 22 | 100009217354694 |
| 23 | 783656713398383 |
| 24 | 6333420109604593 |
| 25 | 52732283687195340 |
| 26 | 451831859926030943 |