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 | 4 |
| 3 | 5 |
| 4 | 18 |
| 5 | 25 |
| 6 | 84 |
| 7 | 124 |
| 8 | 398 |
| 9 | 612 |
| 10 | 1901 |
| 11 | 3012 |
| 12 | 9126 |
| 13 | 14800 |
| 14 | 43968 |
| 15 | 72658 |
| 16 | 212417 |
| 17 | 356544 |
| 18 | 1028520 |
| 19 | 1749344 |
| 20 | 4989477 |
| 21 | 8583258 |
| 22 | 24244139 |
| 23 | 42121079 |
| 24 | 117973702 |
| 25 | 206754379 |
| 26 | 574811040 |
| 27 | 1015179978 |
| 28 | 2803969443 |
| 29 | 4986329826 |