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 | 34 |
| 2 | 244 |
| 3 | 1714 |
| 4 | 12004 |
| 5 | 84034 |
| 6 | 588244 |
| 7 | 4117714 |
| 8 | 28824004 |
| 9 | 201768034 |
| 10 | 1412376244 |
| 11 | 9886633714 |
| 12 | 69206436004 |
| 13 | 484445052034 |
| 14 | 3391115364244 |
| 15 | 23737807549714 |
| 16 | 166164652848004 |
| 17 | 1163152569936034 |
| 18 | 8142067989552244 |
| 19 | 56994475926865714 |