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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 46 |
| 8 | 110 |
| 9 | 273 |
| 10 | 684 |
| 11 | 1746 |
| 12 | 4503 |
| 13 | 11758 |
| 14 | 30943 |
| 15 | 82118 |
| 16 | 219341 |
| 17 | 589485 |
| 18 | 1592447 |
| 19 | 4322433 |
| 20 | 11781565 |
| 21 | 32235688 |
| 22 | 88503331 |
| 23 | 243750729 |
| 24 | 673246211 |
| 25 | 1864422803 |
| 26 | 5175655984 |
| 27 | 14399854855 |
| 28 | 40146793094 |
| 29 | 112145140408 |
| 30 | 313826549732 |
| 31 | 879685174894 |