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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 57 |
| 5 | 234 |
| 6 | 770 |
| 7 | 2136 |
| 8 | 5180 |
| 9 | 11292 |
| 10 | 22599 |
| 11 | 42190 |
| 12 | 74371 |
| 13 | 124950 |
| 14 | 201552 |
| 15 | 313964 |
| 16 | 474510 |
| 17 | 698456 |
| 18 | 1004445 |
| 19 | 1414962 |
| 20 | 1956829 |
| 21 | 2661730 |
| 22 | 3566766 |
| 23 | 4715040 |
| 24 | 6156272 |
| 25 | 7947444 |
| 26 | 10153475 |
| 27 | 12847926 |
| 28 | 16113735 |
| 29 | 20043982 |
| 30 | 24742684 |
| 31 | 30325620 |