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 | 1 |
| 3 | 7 |
| 4 | 9 |
| 5 | 56 |
| 6 | 79 |
| 7 | 470 |
| 8 | 697 |
| 9 | 4048 |
| 10 | 6196 |
| 11 | 35443 |
| 12 | 55455 |
| 13 | 313912 |
| 14 | 499178 |
| 15 | 2804012 |
| 16 | 4514873 |
| 17 | 25211936 |
| 18 | 40999516 |
| 19 | 227881004 |
| 20 | 373585604 |
| 21 | 2068564064 |
| 22 | 3414035527 |
| 23 | 18844224462 |
| 24 | 31278197839 |
| 25 | 172186125456 |
| 26 | 287191809724 |
| 27 | 1577401391626 |
| 28 | 2642070371194 |
| 29 | 14483100716176 |
| 30 | 24347999094724 |