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 | 9 |
| 3 | 27 |
| 4 | 36 |
| 5 | 72 |
| 6 | 132 |
| 7 | 240 |
| 8 | 444 |
| 9 | 816 |
| 10 | 1500 |
| 11 | 2760 |
| 12 | 5076 |
| 13 | 9336 |
| 14 | 17172 |
| 15 | 31584 |
| 16 | 58092 |
| 17 | 106848 |
| 18 | 196524 |
| 19 | 361464 |
| 20 | 664836 |
| 21 | 1222824 |
| 22 | 2249124 |
| 23 | 4136784 |
| 24 | 7608732 |
| 25 | 13994640 |
| 26 | 25740156 |
| 27 | 47343528 |
| 28 | 87078324 |
| 29 | 160162008 |
| 30 | 294583860 |
| 31 | 541824192 |
| 32 | 996570060 |
| 33 | 1832978112 |