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) |
|---|---|
| 4 | 25 |
| 5 | 429 |
| 6 | 3364 |
| 7 | 17602 |
| 8 | 71385 |
| 9 | 242347 |
| 10 | 720792 |
| 11 | 1934076 |
| 12 | 4777337 |
| 13 | 11021713 |
| 14 | 24008532 |
| 15 | 49790614 |
| 16 | 98954626 |
| 17 | 189457350 |
| 18 | 350941064 |
| 19 | 631167840 |
| 20 | 1105440045 |
| 21 | 1890167329 |
| 22 | 3162113836 |
| 23 | 5185330818 |
| 24 | 8348369731 |
| 25 | 13215102985 |
| 26 | 20593381200 |
| 27 | 31626858540 |
| 28 | 47916657405 |
| 29 | 71681161365 |