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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 42 |
| 5 | 130 |
| 6 | 338 |
| 7 | 882 |
| 8 | 2098 |
| 9 | 5042 |
| 10 | 12466 |
| 11 | 28338 |
| 12 | 66226 |
| 13 | 150194 |
| 14 | 326322 |
| 15 | 711346 |
| 16 | 1579698 |
| 17 | 3513010 |
| 18 | 7510706 |
| 19 | 16292530 |
| 20 | 34904754 |
| 21 | 73177778 |
| 22 | 156015282 |
| 23 | 330078898 |
| 24 | 703371954 |
| 25 | 1517066930 |
| 26 | 3211565746 |
| 27 | 6667672242 |
| 28 | 13848320690 |
| 29 | 28478053042 |
| 30 | 58811259570 |