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) |
|---|---|
| 1 | 12 |
| 2 | 144 |
| 3 | 556 |
| 4 | 2239 |
| 5 | 11256 |
| 6 | 58602 |
| 7 | 319439 |
| 8 | 1760946 |
| 9 | 9794226 |
| 10 | 54631117 |
| 11 | 305277128 |
| 12 | 1707053280 |
| 13 | 9549210261 |
| 14 | 53426703442 |
| 15 | 298941739494 |
| 16 | 1672751399083 |
| 17 | 9360192196998 |
| 18 | 52377176867242 |
| 19 | 293090264883289 |
| 20 | 1640067205915482 |