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 | 5 |
| 2 | 13 |
| 3 | 35 |
| 4 | 97 |
| 5 | 275 |
| 6 | 793 |
| 7 | 2315 |
| 8 | 6817 |
| 9 | 20195 |
| 10 | 60073 |
| 11 | 179195 |
| 12 | 535537 |
| 13 | 1602515 |
| 14 | 4799353 |
| 15 | 14381675 |
| 16 | 43112257 |
| 17 | 129271235 |
| 18 | 387682633 |
| 19 | 1162785755 |
| 20 | 3487832977 |
| 21 | 10462450355 |
| 22 | 31385253913 |
| 23 | 94151567435 |
| 24 | 282446313697 |
| 25 | 847322163875 |