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 | 7 |
| 2 | 37 |
| 3 | 163 |
| 4 | 661 |
| 5 | 2643 |
| 6 | 10497 |
| 7 | 41511 |
| 8 | 164073 |
| 9 | 648495 |
| 10 | 2562749 |
| 11 | 10127291 |
| 12 | 40020845 |
| 13 | 158152811 |
| 14 | 624980489 |
| 15 | 2469769903 |
| 16 | 9759926065 |
| 17 | 38568829879 |
| 18 | 152414547541 |
| 19 | 602304889075 |
| 20 | 2380161078405 |
| 21 | 9405812345187 |
| 22 | 37169461719153 |
| 23 | 146884589311479 |
| 24 | 580451843386809 |
| 25 | 2293803210617951 |
| 26 | 9064547264192237 |
| 27 | 35820865853787467 |