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 | 3 |
| 2 | 3 |
| 3 | 6 |
| 4 | 16 |
| 5 | 46 |
| 6 | 142 |
| 7 | 461 |
| 8 | 1542 |
| 9 | 5278 |
| 10 | 18417 |
| 11 | 65218 |
| 12 | 233816 |
| 13 | 846938 |
| 14 | 3094943 |
| 15 | 11395715 |
| 16 | 42237936 |
| 17 | 157465847 |
| 18 | 590075550 |
| 19 | 2221391912 |
| 20 | 8397223487 |
| 21 | 31861406058 |
| 22 | 121300625969 |
| 23 | 463233477550 |
| 24 | 1774034788166 |
| 25 | 6811612470692 |
| 26 | 26216538077715 |
| 27 | 101125406981562 |