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 | 58 |
| 2 | 1653 |
| 3 | 30856 |
| 4 | 424270 |
| 5 | 4582116 |
| 6 | 40475358 |
| 7 | 300674088 |
| 8 | 1916797311 |
| 9 | 10648873950 |
| 10 | 52179482355 |
| 11 | 227692286640 |
| 12 | 891794789340 |
| 13 | 3155581562280 |
| 14 | 10142940735900 |
| 15 | 29752626158640 |
| 16 | 79960182801345 |
| 17 | 197548686920970 |
| 18 | 449972009097765 |
| 19 | 947309492837400 |