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 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 8 |
| 6 | 14 |
| 7 | 26 |
| 8 | 53 |
| 9 | 117 |
| 10 | 280 |
| 11 | 721 |
| 12 | 1989 |
| 13 | 5844 |
| 14 | 18188 |
| 15 | 59652 |
| 16 | 205305 |
| 17 | 739041 |
| 18 | 2775190 |
| 19 | 10846975 |
| 20 | 44039765 |
| 21 | 185391480 |
| 22 | 807776210 |
| 23 | 3637193486 |
| 24 | 16900721837 |
| 25 | 80939650565 |
| 26 | 399061251260 |
| 27 | 2023408865997 |
| 28 | 10540656630133 |
| 29 | 56362743769012 |