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 | 145 |
| 2 | 4339 |
| 3 | 55171 |
| 4 | 416773 |
| 5 | 2218645 |
| 6 | 9195511 |
| 7 | 31608967 |
| 8 | 94016137 |
| 9 | 249258777 |
| 10 | 601883259 |
| 11 | 1345167627 |
| 12 | 2817026445 |
| 13 | 5581287453 |
| 14 | 10542186111 |
| 15 | 19101404943 |
| 16 | 33368594193 |
| 17 | 56438048673 |
| 18 | 92746082819 |
| 19 | 148525641875 |
| 20 | 232376811797 |
| 21 | 355974143909 |
| 22 | 534934092551 |
| 23 | 789868374935 |