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) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 103 |
| 4 | 736 |
| 5 | 4571 |
| 6 | 25326 |
| 7 | 127415 |
| 8 | 588687 |
| 9 | 2518997 |
| 10 | 10053739 |
| 11 | 37656707 |
| 12 | 133084998 |
| 13 | 445949359 |
| 14 | 1422934989 |
| 15 | 4340110439 |
| 16 | 12697803333 |
| 17 | 35744330644 |
| 18 | 97081519369 |
| 19 | 255032046536 |
| 20 | 649459943602 |
| 21 | 1606518048420 |
| 22 | 3867119228081 |
| 23 | 9073566868140 |
| 24 | 20783186834063 |