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 | 11 |
| 3 | 23 |
| 4 | 379 |
| 5 | 781 |
| 6 | 1160 |
| 7 | 5421 |
| 8 | 12002 |
| 9 | 17423 |
| 10 | 377885 |
| 11 | 395308 |
| 12 | 1563809 |
| 13 | 8214353 |
| 14 | 9778162 |
| 15 | 27770677 |
| 16 | 37548839 |
| 17 | 65319516 |
| 18 | 168187871 |
| 19 | 1915386097 |
| 20 | 9745118356 |
| 21 | 11660504453 |
| 22 | 44726631715 |
| 23 | 56387136168 |
| 24 | 157500904051 |
| 25 | 4308911545545 |
| 26 | 17393147086231 |
| 27 | 21702058631776 |