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 | 8 |
| 3 | 22 |
| 4 | 55 |
| 5 | 143 |
| 6 | 349 |
| 7 | 885 |
| 8 | 2138 |
| 9 | 5356 |
| 10 | 12890 |
| 11 | 32092 |
| 12 | 77178 |
| 13 | 191530 |
| 14 | 460934 |
| 15 | 1141888 |
| 16 | 2751551 |
| 17 | 6809421 |
| 18 | 16431189 |
| 19 | 40633227 |
| 20 | 98175341 |
| 21 | 242626935 |
| 22 | 586867463 |
| 23 | 1449457735 |
| 24 | 3509084995 |
| 25 | 8661201115 |
| 26 | 20982916461 |
| 27 | 51755457003 |