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 | 30 |
| 5 | 67 |
| 6 | 195 |
| 7 | 670 |
| 8 | 2623 |
| 9 | 11437 |
| 10 | 54692 |
| 11 | 283625 |
| 12 | 1581303 |
| 13 | 9413380 |
| 14 | 59497049 |
| 15 | 397402597 |
| 16 | 2794008798 |
| 17 | 20606565063 |
| 18 | 158955946879 |
| 19 | 1279119138486 |
| 20 | 10712907438835 |
| 21 | 93190762200361 |
| 22 | 840437752639132 |
| 23 | 7844783028326405 |
| 24 | 75673025264120531 |
| 25 | 753330825335964276 |