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 | 5 |
| 2 | 17 |
| 3 | 49 |
| 4 | 128 |
| 5 | 321 |
| 6 | 790 |
| 7 | 1924 |
| 8 | 4664 |
| 9 | 11282 |
| 10 | 27262 |
| 11 | 65843 |
| 12 | 158988 |
| 13 | 383863 |
| 14 | 926761 |
| 15 | 2237435 |
| 16 | 5401685 |
| 17 | 13040863 |
| 18 | 31483472 |
| 19 | 76007871 |
| 20 | 183499282 |
| 21 | 443006506 |
| 22 | 1069512368 |
| 23 | 2582031320 |
| 24 | 6233575089 |
| 25 | 15049181582 |
| 26 | 36331938341 |
| 27 | 87713058356 |