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 | 1 |
| 2 | 4 |
| 3 | 39 |
| 4 | 1219 |
| 5 | 83435 |
| 6 | 9223092 |
| 7 | 1453132944 |
| 8 | 307690667072 |
| 9 | 84241805734539 |
| 10 | 28963120073957838 |
| 11 | 12217399235411398127 |
| 12 | 6204484017822892034404 |
| 13 | 3734180195629471796396217 |
| 14 | 2628347798377200707293720724 |
| 15 | 2139135966227357959535426526975 |
| 16 | 1993415431315860419823374898234950 |