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 | 4 |
| 3 | 8 |
| 4 | 28 |
| 5 | 80 |
| 6 | 308 |
| 7 | 984 |
| 8 | 3980 |
| 9 | 13472 |
| 10 | 56164 |
| 11 | 197032 |
| 12 | 838396 |
| 13 | 3013872 |
| 14 | 13015188 |
| 15 | 47624568 |
| 16 | 207971436 |
| 17 | 771336512 |
| 18 | 3397886660 |
| 19 | 12736715592 |
| 20 | 56502898140 |
| 21 | 213618833808 |
| 22 | 953139545076 |
| 23 | 3629043226392 |
| 24 | 16270547827020 |
| 25 | 62317467147744 |