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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 53 |
| 3 | 427 |
| 4 | 3593 |
| 5 | 31087 |
| 6 | 273533 |
| 7 | 2430547 |
| 8 | 21718673 |
| 9 | 194686807 |
| 10 | 1748275013 |
| 11 | 15714943867 |
| 12 | 141336838553 |
| 13 | 1271543265727 |
| 14 | 11441447985293 |
| 15 | 102960824836387 |
| 16 | 926586388371233 |
| 17 | 8338972319559847 |
| 18 | 75049224997132373 |
| 19 | 675435395579660107 |