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 | 28 |
| 2 | 462 |
| 3 | 6832 |
| 4 | 97957 |
| 5 | 1394180 |
| 6 | 19862674 |
| 7 | 284156608 |
| 8 | 4086496362 |
| 9 | 59089988216 |
| 10 | 858975619676 |
| 11 | 12549322976672 |
| 12 | 184195104642157 |
| 13 | 2715174884250004 |
| 14 | 40181870424263146 |
| 15 | 596810833742837536 |
| 16 | 8893877150513222014 |
| 17 | 132947157383427373320 |
| 18 | 1992954280253792526660 |