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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 11 |
| 6 | 31 |
| 7 | 71 |
| 8 | 151 |
| 9 | 343 |
| 10 | 871 |
| 11 | 2311 |
| 12 | 6001 |
| 13 | 15081 |
| 14 | 37493 |
| 15 | 94381 |
| 16 | 241931 |
| 17 | 625771 |
| 18 | 1617211 |
| 19 | 4164763 |
| 20 | 10719793 |
| 21 | 27674473 |
| 22 | 71722773 |
| 23 | 186353453 |
| 24 | 484657729 |
| 25 | 1260984161 |
| 26 | 3283294561 |
| 27 | 8559401761 |
| 28 | 22343836711 |
| 29 | 58391858383 |
| 30 | 152722920691 |
| 31 | 399719304411 |