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) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 10 |
| 4 | 64 |
| 5 | 316 |
| 6 | 1789 |
| 7 | 9738 |
| 8 | 54293 |
| 9 | 300456 |
| 10 | 1669005 |
| 11 | 9263141 |
| 12 | 51430163 |
| 13 | 285537725 |
| 14 | 1585321263 |
| 15 | 8801860535 |
| 16 | 48868792430 |
| 17 | 271324801628 |
| 18 | 1506424664770 |
| 19 | 8363834463324 |
| 20 | 46436926280661 |
| 21 | 257822913340328 |
| 22 | 1431461142742217 |