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 | 13 |
| 2 | 145 |
| 3 | 1513 |
| 4 | 16658 |
| 5 | 178469 |
| 6 | 1918732 |
| 7 | 20599895 |
| 8 | 221333623 |
| 9 | 2377449633 |
| 10 | 25538644681 |
| 11 | 274338521973 |
| 12 | 2946944060015 |
| 13 | 31656188524253 |
| 14 | 340051734132151 |
| 15 | 3652845905487029 |
| 16 | 39238984432264619 |
| 17 | 421506370243881833 |