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 | 58 |
| 4 | 272 |
| 5 | 1154 |
| 6 | 4757 |
| 7 | 19378 |
| 8 | 78422 |
| 9 | 315994 |
| 10 | 1269270 |
| 11 | 5086294 |
| 12 | 20345092 |
| 13 | 81265106 |
| 14 | 324240331 |
| 15 | 1292556986 |
| 16 | 5149091916 |
| 17 | 20500830986 |
| 18 | 81586994576 |
| 19 | 324577199086 |
| 20 | 1290904257426 |
| 21 | 5133037194706 |
| 22 | 20407032157936 |
| 23 | 81119882902118 |