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 | 1 |
| 1 | 511 |
| 2 | 19171 |
| 3 | 242461 |
| 4 | 1690981 |
| 5 | 8124571 |
| 6 | 30275911 |
| 7 | 93864121 |
| 8 | 253202761 |
| 9 | 612579511 |
| 10 | 1357947691 |
| 11 | 2801832661 |
| 12 | 5444719021 |
| 13 | 10056547411 |
| 14 | 17782312591 |
| 15 | 30276117361 |
| 16 | 49868399761 |
| 17 | 79771413871 |
| 18 | 124328407411 |
| 19 | 189312302221 |
| 20 | 282280046581 |
| 21 | 412989171211 |
| 22 | 593883443671 |