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) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 35 |
| 4 | 138 |
| 5 | 488 |
| 6 | 1564 |
| 7 | 4733 |
| 8 | 13734 |
| 9 | 38711 |
| 10 | 106846 |
| 11 | 290496 |
| 12 | 781264 |
| 13 | 2084753 |
| 14 | 5531846 |
| 15 | 14619811 |
| 16 | 38527834 |
| 17 | 101328712 |
| 18 | 266119228 |
| 19 | 698218525 |
| 20 | 1830665830 |
| 21 | 4797572551 |
| 22 | 12568780126 |
| 23 | 32920653120 |
| 24 | 86214096768 |
| 25 | 225758326273 |