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 | 3 |
| 3 | 11 |
| 4 | 41 |
| 5 | 155 |
| 6 | 603 |
| 7 | 2361 |
| 8 | 9321 |
| 9 | 37015 |
| 10 | 147657 |
| 11 | 591227 |
| 12 | 2374539 |
| 13 | 9561487 |
| 14 | 38585555 |
| 15 | 156007667 |
| 16 | 631806555 |
| 17 | 2562434223 |
| 18 | 10405918209 |
| 19 | 42306525037 |
| 20 | 172180092143 |
| 21 | 701397054549 |
| 22 | 2859651782649 |
| 23 | 11668050956347 |
| 24 | 47642140547239 |
| 25 | 194655761552949 |
| 26 | 795800965884627 |