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 | 9 |
| 2 | 14 |
| 3 | 56 |
| 4 | 260 |
| 5 | 1306 |
| 6 | 7394 |
| 7 | 43951 |
| 8 | 273509 |
| 9 | 1761231 |
| 10 | 11635311 |
| 11 | 78551945 |
| 12 | 539622083 |
| 13 | 3762656337 |
| 14 | 26579694095 |
| 15 | 189938085415 |
| 16 | 1371475597978 |
| 17 | 9996841746666 |
| 18 | 73499537666630 |
| 19 | 544684691301292 |
| 20 | 4065992493282511 |
| 21 | 30555869899381064 |
| 22 | 231043525054841279 |
| 23 | 1756887541883726014 |