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) |
|---|---|
| 3 | 1 |
| 4 | 10 |
| 5 | 67 |
| 6 | 380 |
| 7 | 1976 |
| 8 | 9771 |
| 9 | 46845 |
| 10 | 220232 |
| 11 | 1022498 |
| 12 | 4710021 |
| 13 | 21593848 |
| 14 | 98750485 |
| 15 | 451158834 |
| 16 | 2061525163 |
| 17 | 9429060852 |
| 18 | 43193760271 |
| 19 | 198255105055 |
| 20 | 912011899565 |
| 21 | 4205605922556 |
| 22 | 19442627224940 |
| 23 | 90115768761346 |
| 24 | 418762733418510 |