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 | 23 |
| 2 | 203 |
| 3 | 1823 |
| 4 | 16403 |
| 5 | 147623 |
| 6 | 1328603 |
| 7 | 11957423 |
| 8 | 107616803 |
| 9 | 968551223 |
| 10 | 8716961003 |
| 11 | 78452649023 |
| 12 | 706073841203 |
| 13 | 6354664570823 |
| 14 | 57191981137403 |
| 15 | 514727830236623 |
| 16 | 4632550472129603 |
| 17 | 41692954249166423 |
| 18 | 375236588242497803 |