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 | 28 |
| 2 | 784 |
| 3 | 11990 |
| 4 | 116692 |
| 5 | 816361 |
| 6 | 4480391 |
| 7 | 20568693 |
| 8 | 82733667 |
| 9 | 301228048 |
| 10 | 1015242774 |
| 11 | 3216158234 |
| 12 | 9677475342 |
| 13 | 27865037554 |
| 14 | 77192516888 |
| 15 | 206580752375 |
| 16 | 535811566173 |
| 17 | 1350500930653 |
| 18 | 3315175437671 |
| 19 | 7940967421582 |
| 20 | 18591190564502 |
| 21 | 42601309065441 |
| 22 | 95664964823719 |
| 23 | 210745412046812 |