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 | 3 |
| 2 | 12 |
| 3 | 37 |
| 4 | 111 |
| 5 | 303 |
| 6 | 804 |
| 7 | 2022 |
| 8 | 4950 |
| 9 | 11715 |
| 10 | 27081 |
| 11 | 61083 |
| 12 | 135112 |
| 13 | 293142 |
| 14 | 625620 |
| 15 | 1314267 |
| 16 | 2722323 |
| 17 | 5564172 |
| 18 | 11234865 |
| 19 | 22424904 |
| 20 | 44284545 |
| 21 | 86573147 |
| 22 | 167648418 |
| 23 | 321746907 |
| 24 | 612274678 |
| 25 | 1155782109 |
| 26 | 2165116416 |
| 27 | 4026391221 |
| 28 | 7435806048 |
| 29 | 13641093684 |
| 30 | 24865920932 |