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 | 4 |
| 1 | 18 |
| 2 | 130 |
| 3 | 1134 |
| 4 | 10642 |
| 5 | 103158 |
| 6 | 1015690 |
| 7 | 10078254 |
| 8 | 100390882 |
| 9 | 1001953638 |
| 10 | 10009766650 |
| 11 | 100048830174 |
| 12 | 1000244144722 |
| 13 | 10001220711318 |
| 14 | 100006103532010 |
| 15 | 1000030517610894 |
| 16 | 10000152587956162 |
| 17 | 100000762939584198 |
| 18 | 1000003814697527770 |
| 19 | 10000019073486852414 |