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 | 7 |
| 3 | 32 |
| 4 | 177 |
| 5 | 967 |
| 6 | 5444 |
| 7 | 30982 |
| 8 | 178870 |
| 9 | 1043534 |
| 10 | 6147894 |
| 11 | 36525052 |
| 12 | 218635791 |
| 13 | 1317499741 |
| 14 | 7987022942 |
| 15 | 48681694352 |
| 16 | 298175840393 |
| 17 | 1834480258489 |
| 18 | 11332354653885 |
| 19 | 70266266183888 |
| 20 | 437183447677006 |
| 21 | 2728700799802620 |