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 | 1 |
| 2 | 45 |
| 3 | 46 |
| 4 | 2069 |
| 5 | 2115 |
| 6 | 95129 |
| 7 | 97244 |
| 8 | 4373865 |
| 9 | 4471109 |
| 10 | 201102661 |
| 11 | 205573770 |
| 12 | 9246348541 |
| 13 | 9451922311 |
| 14 | 425130930225 |
| 15 | 434582852536 |
| 16 | 19546776441809 |
| 17 | 19981359294345 |
| 18 | 898726585392989 |
| 19 | 918707944687334 |
| 20 | 41321876151635685 |
| 21 | 42240584096323019 |
| 22 | 1899907576389848521 |