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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 20 |
| 5 | 49 |
| 6 | 123 |
| 7 | 292 |
| 8 | 701 |
| 9 | 1653 |
| 10 | 3874 |
| 11 | 8977 |
| 12 | 20711 |
| 13 | 47344 |
| 14 | 107692 |
| 15 | 243382 |
| 16 | 547264 |
| 17 | 1224048 |
| 18 | 2725483 |
| 19 | 6040796 |
| 20 | 13334354 |
| 21 | 29316445 |
| 22 | 64215841 |
| 23 | 140159357 |
| 24 | 304890958 |
| 25 | 661097630 |
| 26 | 1429083295 |
| 27 | 3080159882 |
| 28 | 6620188725 |
| 29 | 14190463947 |
| 30 | 30338920339 |
| 31 | 64702805452 |