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 | 6 |
| 1 | 21 |
| 2 | 91 |
| 3 | 441 |
| 4 | 2275 |
| 5 | 12201 |
| 6 | 67171 |
| 7 | 376761 |
| 8 | 2142595 |
| 9 | 12313161 |
| 10 | 71340451 |
| 11 | 415998681 |
| 12 | 2438235715 |
| 13 | 14350108521 |
| 14 | 84740914531 |
| 15 | 501790686201 |
| 16 | 2978035877635 |
| 17 | 17706908038281 |
| 18 | 105443761093411 |
| 19 | 628709267031321 |
| 20 | 3752628871164355 |
| 21 | 22418196307542441 |
| 22 | 134023513204581091 |