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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 27 |
| 5 | 79 |
| 6 | 218 |
| 7 | 622 |
| 8 | 1753 |
| 9 | 5007 |
| 10 | 14274 |
| 11 | 40954 |
| 12 | 117548 |
| 13 | 338485 |
| 14 | 975721 |
| 15 | 2817871 |
| 16 | 8146510 |
| 17 | 23581381 |
| 18 | 68322672 |
| 19 | 198138512 |
| 20 | 575058726 |
| 21 | 1670250623 |
| 22 | 4854444560 |
| 23 | 14117859226 |
| 24 | 41081418963 |
| 25 | 119606139728 |