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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 63 |
| 5 | 344 |
| 6 | 1383 |
| 7 | 4685 |
| 8 | 14323 |
| 9 | 41119 |
| 10 | 113590 |
| 11 | 306605 |
| 12 | 816410 |
| 13 | 2157046 |
| 14 | 5674578 |
| 15 | 14893364 |
| 16 | 39040633 |
| 17 | 102273950 |
| 18 | 267839033 |
| 19 | 701315739 |
| 20 | 1836198205 |
| 21 | 4807389285 |
| 22 | 12586103720 |
| 23 | 32951083211 |
| 24 | 86267338468 |
| 25 | 225851160284 |
| 26 | 591286410708 |
| 27 | 1548008385490 |