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 | 1 |
| 2 | 18 |
| 3 | 282 |
| 4 | 4740 |
| 5 | 89355 |
| 6 | 1896846 |
| 7 | 45050852 |
| 8 | 1186829064 |
| 9 | 34391135205 |
| 10 | 1087928669410 |
| 11 | 37322190255966 |
| 12 | 1380461544684300 |
| 13 | 54772368958008975 |
| 14 | 2320775754168090870 |
| 15 | 104596636848116060040 |
| 16 | 4996700995031905899536 |
| 17 | 252208510175779038669321 |