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 | 5 |
| 2 | 23 |
| 3 | 101 |
| 4 | 359 |
| 5 | 1145 |
| 6 | 3527 |
| 7 | 10735 |
| 8 | 32907 |
| 9 | 101635 |
| 10 | 315579 |
| 11 | 982305 |
| 12 | 3059025 |
| 13 | 9524031 |
| 14 | 29640801 |
| 15 | 92224095 |
| 16 | 286910991 |
| 17 | 892560177 |
| 18 | 2776725201 |
| 19 | 8638459639 |
| 20 | 26874806287 |
| 21 | 83609764417 |
| 22 | 260117322353 |
| 23 | 809247413805 |
| 24 | 2517636208515 |
| 25 | 7832571212121 |