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 | 1 |
| 1 | 17 |
| 2 | 65 |
| 3 | 209 |
| 4 | 641 |
| 5 | 1937 |
| 6 | 5825 |
| 7 | 17489 |
| 8 | 52481 |
| 9 | 157457 |
| 10 | 472385 |
| 11 | 1417169 |
| 12 | 4251521 |
| 13 | 12754577 |
| 14 | 38263745 |
| 15 | 114791249 |
| 16 | 344373761 |
| 17 | 1033121297 |
| 18 | 3099363905 |
| 19 | 9298091729 |
| 20 | 27894275201 |
| 21 | 83682825617 |
| 22 | 251048476865 |
| 23 | 753145430609 |
| 24 | 2259436291841 |
| 25 | 6778308875537 |
| 26 | 20334926626625 |