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 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 24 |
| 5 | 42 |
| 6 | 78 |
| 7 | 144 |
| 8 | 264 |
| 9 | 486 |
| 10 | 894 |
| 11 | 1620 |
| 12 | 2964 |
| 13 | 5376 |
| 14 | 9798 |
| 15 | 17760 |
| 16 | 32292 |
| 17 | 58398 |
| 18 | 105960 |
| 19 | 191466 |
| 20 | 346854 |
| 21 | 626172 |
| 22 | 1132800 |
| 23 | 2043246 |
| 24 | 3692406 |
| 25 | 6655068 |
| 26 | 12015126 |
| 27 | 21641526 |
| 28 | 39039810 |
| 29 | 70277016 |
| 30 | 126682584 |
| 31 | 227928780 |
| 32 | 410605008 |
| 33 | 738423492 |
| 34 | 1329477732 |