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 | 4 |
| 2 | 49 |
| 3 | 374 |
| 4 | 2499 |
| 5 | 15624 |
| 6 | 93749 |
| 7 | 546874 |
| 8 | 3124999 |
| 9 | 17578124 |
| 10 | 97656249 |
| 11 | 537109374 |
| 12 | 2929687499 |
| 13 | 15869140624 |
| 14 | 85449218749 |
| 15 | 457763671874 |
| 16 | 2441406249999 |
| 17 | 12969970703124 |
| 18 | 68664550781249 |
| 19 | 362396240234374 |
| 20 | 1907348632812499 |
| 21 | 10013580322265624 |
| 22 | 52452087402343749 |
| 23 | 274181365966796874 |