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) |
|---|---|
| 4 | 1 |
| 5 | 10 |
| 6 | 67 |
| 7 | 379 |
| 8 | 1958 |
| 9 | 9576 |
| 10 | 45190 |
| 11 | 208084 |
| 12 | 941480 |
| 13 | 4204949 |
| 14 | 18597694 |
| 15 | 81635060 |
| 16 | 356220369 |
| 17 | 1547066801 |
| 18 | 6693361973 |
| 19 | 28868868733 |
| 20 | 124194904215 |
| 21 | 533156609953 |
| 22 | 2284722747583 |
| 23 | 9776008778375 |
| 24 | 41777089615201 |
| 25 | 178338353574365 |
| 26 | 760586650190997 |