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 | 6 |
| 2 | 35 |
| 3 | 202 |
| 4 | 1180 |
| 5 | 6910 |
| 6 | 40489 |
| 7 | 237257 |
| 8 | 1390294 |
| 9 | 8146946 |
| 10 | 47740080 |
| 11 | 279750873 |
| 12 | 1639304998 |
| 13 | 9606121524 |
| 14 | 56290666386 |
| 15 | 329856239533 |
| 16 | 1932916160782 |
| 17 | 11326646086502 |
| 18 | 66372724369488 |
| 19 | 388935833836820 |
| 20 | 2279115167854767 |