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 | 10 |
| 3 | 28 |
| 4 | 80 |
| 5 | 211 |
| 6 | 569 |
| 7 | 1455 |
| 8 | 3806 |
| 9 | 9564 |
| 10 | 24565 |
| 11 | 61080 |
| 12 | 155041 |
| 13 | 382920 |
| 14 | 964163 |
| 15 | 2370712 |
| 16 | 5934974 |
| 17 | 14548685 |
| 18 | 36266755 |
| 19 | 88711181 |
| 20 | 220415107 |
| 21 | 538305745 |
| 22 | 1334040167 |
| 23 | 3254193849 |
| 24 | 8047710361 |
| 25 | 19613210297 |
| 26 | 48419611161 |