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 | 3 |
| 1 | 12 |
| 2 | 102 |
| 3 | 1344 |
| 4 | 10212 |
| 5 | 109104 |
| 6 | 1010004 |
| 7 | 10909104 |
| 8 | 105882372 |
| 9 | 1413350400 |
| 10 | 10102223208 |
| 11 | 114737461440 |
| 12 | 1021097900424 |
| 13 | 10921790676000 |
| 14 | 104844305394000 |
| 15 | 1355394166984704 |
| 16 | 10073631600468000 |
| 17 | 110177492439680640 |
| 18 | 1010002989998020008 |
| 19 | 10909090909090909104 |