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 | 2 |
| 1 | 7 |
| 2 | 23 |
| 3 | 78 |
| 4 | 274 |
| 5 | 988 |
| 6 | 3628 |
| 7 | 13495 |
| 8 | 50675 |
| 9 | 191673 |
| 10 | 729145 |
| 11 | 2786655 |
| 12 | 10691111 |
| 13 | 41150011 |
| 14 | 158825371 |
| 15 | 614483086 |
| 16 | 2382366586 |
| 17 | 9253540456 |
| 18 | 36001307656 |
| 19 | 140269835866 |
| 20 | 547245301906 |
| 21 | 2137552658206 |
| 22 | 8358366985726 |
| 23 | 32715599554876 |
| 24 | 128168506456852 |
| 25 | 502538379368656 |
| 26 | 1971926625140816 |