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) |
|---|---|
| 5 | 0 |
| 6 | 97 |
| 7 | 744 |
| 8 | 3628 |
| 9 | 15038 |
| 10 | 59963 |
| 11 | 245386 |
| 12 | 1054116 |
| 13 | 4585666 |
| 14 | 19816317 |
| 15 | 84377528 |
| 16 | 354143757 |
| 17 | 1472404694 |
| 18 | 6105113905 |
| 19 | 25314316974 |
| 20 | 105009933736 |
| 21 | 435538239600 |
| 22 | 1804712603943 |
| 23 | 7467462109856 |
| 24 | 30859243303779 |
| 25 | 127410491972804 |
| 26 | 525761755401512 |
| 27 | 2168906840165128 |