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 | 12 |
| 2 | 114 |
| 3 | 1012 |
| 4 | 8775 |
| 5 | 75516 |
| 6 | 649264 |
| 7 | 5593068 |
| 8 | 48336171 |
| 9 | 419276660 |
| 10 | 3650774820 |
| 11 | 31907617560 |
| 12 | 279871768995 |
| 13 | 2463161027292 |
| 14 | 21747225841440 |
| 15 | 192575673551584 |
| 16 | 1710009515037060 |
| 17 | 15223466050169520 |
| 18 | 135853465827080970 |
| 19 | 1215067013768834100 |
| 20 | 10890252031152078585 |