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 | 1208 |
| 2 | 46412 |
| 3 | 618122 |
| 4 | 4605367 |
| 5 | 23762681 |
| 6 | 95151695 |
| 7 | 316478382 |
| 8 | 913517248 |
| 9 | 1009036085 |
| 10 | 2578852664 |
| 11 | 6031717260 |
| 12 | 13109994192 |
| 13 | 26790192075 |
| 14 | 51940506497 |
| 15 | 96233591016 |
| 16 | 171382727700 |
| 17 | 294780777472 |
| 18 | 491633355232 |
| 19 | 516626475073 |