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 | 1 |
| 3 | 1 |
| 4 | 7 |
| 5 | 31 |
| 6 | 91 |
| 7 | 211 |
| 8 | 1681 |
| 9 | 12097 |
| 10 | 57961 |
| 11 | 209881 |
| 12 | 1874071 |
| 13 | 17842111 |
| 14 | 117303187 |
| 15 | 575683291 |
| 16 | 5691897121 |
| 17 | 65641390081 |
| 18 | 544238393041 |
| 19 | 3362783785777 |
| 20 | 36455473647271 |
| 21 | 485442581801311 |
| 22 | 4828464958268491 |
| 23 | 35900587138847971 |
| 24 | 423276450114749617 |
| 25 | 6318491163509870401 |