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 | 4 |
| 3 | 19 |
| 4 | 72 |
| 5 | 338 |
| 6 | 1289 |
| 7 | 6027 |
| 8 | 23117 |
| 9 | 107746 |
| 10 | 415058 |
| 11 | 1929383 |
| 12 | 7456777 |
| 13 | 34584731 |
| 14 | 134005510 |
| 15 | 620344059 |
| 16 | 2408498148 |
| 17 | 11131638368 |
| 18 | 43289074671 |
| 19 | 199800878749 |
| 20 | 778025282080 |
| 21 | 3586777011141 |
| 22 | 13982303458588 |
| 23 | 64394916131100 |
| 24 | 251261623174835 |
| 25 | 1156165698462868 |
| 26 | 4514741175877259 |