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 | 16 |
| 3 | 37 |
| 4 | 94 |
| 5 | 259 |
| 6 | 748 |
| 7 | 2209 |
| 8 | 6586 |
| 9 | 19711 |
| 10 | 59080 |
| 11 | 177181 |
| 12 | 531478 |
| 13 | 1594363 |
| 14 | 4783012 |
| 15 | 14348953 |
| 16 | 43046770 |
| 17 | 129140215 |
| 18 | 387420544 |
| 19 | 1162261525 |
| 20 | 3486784462 |
| 21 | 10460353267 |
| 22 | 31381059676 |
| 23 | 94143178897 |
| 24 | 282429536554 |
| 25 | 847288609519 |
| 26 | 2541865828408 |
| 27 | 7625597485069 |
| 28 | 22876792455046 |