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 | 11 |
| 3 | 27 |
| 4 | 65 |
| 5 | 157 |
| 6 | 379 |
| 7 | 915 |
| 8 | 2209 |
| 9 | 5333 |
| 10 | 12875 |
| 11 | 31083 |
| 12 | 75041 |
| 13 | 181165 |
| 14 | 437371 |
| 15 | 1055907 |
| 16 | 2549185 |
| 17 | 6154277 |
| 18 | 14857739 |
| 19 | 35869755 |
| 20 | 86597249 |
| 21 | 209064253 |
| 22 | 504725755 |
| 23 | 1218515763 |
| 24 | 2941757281 |
| 25 | 7102030325 |
| 26 | 17145817931 |
| 27 | 41393666187 |
| 28 | 99933150305 |
| 29 | 241259966797 |
| 30 | 582453083899 |