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 | 6 |
| 2 | 36 |
| 3 | 84 |
| 4 | 192 |
| 5 | 426 |
| 6 | 858 |
| 7 | 1704 |
| 8 | 3330 |
| 9 | 6390 |
| 10 | 12150 |
| 11 | 22938 |
| 12 | 43044 |
| 13 | 80424 |
| 14 | 149766 |
| 15 | 278160 |
| 16 | 515568 |
| 17 | 954072 |
| 18 | 1763304 |
| 19 | 3255666 |
| 20 | 6006342 |
| 21 | 11074116 |
| 22 | 20407650 |
| 23 | 37592934 |
| 24 | 69228330 |
| 25 | 127454070 |
| 26 | 234605316 |
| 27 | 431771328 |
| 28 | 794539482 |
| 29 | 1461954876 |
| 30 | 2689788048 |