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 | 0 |
| 1 | 15 |
| 2 | 465 |
| 3 | 11102 |
| 4 | 236997 |
| 5 | 4751010 |
| 6 | 91474890 |
| 7 | 1712391420 |
| 8 | 31398038701 |
| 9 | 566621243642 |
| 10 | 10097483539038 |
| 11 | 178113001428004 |
| 12 | 3115342162844450 |
| 13 | 54103694774702292 |
| 14 | 933929099838928692 |
| 15 | 16037182307150776056 |
| 16 | 274132978890654857853 |
| 17 | 4667160114821964359530 |
| 18 | 79177297937966956038102 |
| 19 | 1338972240005810710258452 |