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 | 2 |
| 2 | 45 |
| 3 | 92 |
| 4 | 2069 |
| 5 | 4230 |
| 6 | 95129 |
| 7 | 194488 |
| 8 | 4373865 |
| 9 | 8942218 |
| 10 | 201102661 |
| 11 | 411147540 |
| 12 | 9246348541 |
| 13 | 18903844622 |
| 14 | 425130930225 |
| 15 | 869165705072 |
| 16 | 19546776441809 |
| 17 | 39962718588690 |
| 18 | 898726585392989 |
| 19 | 1837415889374668 |
| 20 | 41321876151635685 |
| 21 | 84481168192646038 |