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 | 3 |
| 1 | 7 |
| 2 | 27 |
| 3 | 159 |
| 4 | 1267 |
| 5 | 12663 |
| 6 | 151947 |
| 7 | 2127247 |
| 8 | 34035939 |
| 9 | 612646887 |
| 10 | 12252937723 |
| 11 | 269564629887 |
| 12 | 6469551117267 |
| 13 | 168208329048919 |
| 14 | 4709833213369707 |
| 15 | 141294996401091183 |
| 16 | 4521439884834917827 |
| 17 | 153728956084387206087 |