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 | 2 |
| 2 | 71 |
| 3 | 828 |
| 4 | 1828 |
| 5 | 45904 |
| 6 | 523536 |
| 7 | 287471 |
| 8 | 35266249 |
| 9 | 775724709 |
| 10 | 3699959574 |
| 11 | 96696762772 |
| 12 | 407663035354 |
| 13 | 7594571382178 |
| 14 | 52516642742746 |
| 15 | 639193200305992 |
| 16 | 1817413596629043 |
| 17 | 57290033429526059 |
| 18 | 563073813232862794 |
| 19 | 3490763233829880753 |
| 20 | 19525101901157383418 |