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) |
|---|---|
| 3 | 1 |
| 4 | 37 |
| 5 | 1865 |
| 6 | 122961 |
| 7 | 10278281 |
| 8 | 1062714245 |
| 9 | 133215991777 |
| 10 | 19913088181377 |
| 11 | 3500271565033393 |
| 12 | 714944028588443461 |
| 13 | 167950356430067342489 |
| 14 | 44970653636552995400721 |
| 15 | 13617086217015989835215993 |
| 16 | 4630206565577103694905252965 |
| 17 | 1756940670213816382344684605809 |
| 18 | 739791104690854220148748269632001 |