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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 16 |
| 6 | 57 |
| 7 | 286 |
| 8 | 1431 |
| 9 | 9064 |
| 10 | 51398 |
| 11 | 359787 |
| 12 | 3118155 |
| 13 | 25568872 |
| 14 | 223727631 |
| 15 | 2311852188 |
| 16 | 15990310968 |
| 17 | 105935810164 |
| 18 | 1038449718056 |
| 19 | 10903722039589 |
| 20 | 185715007642033 |
| 21 | 3528585145198628 |
| 22 | 46753753173881822 |
| 23 | 658243630211230916 |
| 24 | 9215410822957232825 |
| 25 | 197209791611284782456 |
| 26 | 2112570763708981231112 |