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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 26 |
| 4 | 114 |
| 5 | 459 |
| 6 | 1892 |
| 7 | 7660 |
| 8 | 31081 |
| 9 | 125464 |
| 10 | 506025 |
| 11 | 2036706 |
| 12 | 8189555 |
| 13 | 32894825 |
| 14 | 132033140 |
| 15 | 529614616 |
| 16 | 2123365038 |
| 17 | 8509634259 |
| 18 | 34092146068 |
| 19 | 136546197412 |
| 20 | 546774790297 |
| 21 | 2189060331762 |
| 22 | 8762770476060 |
| 23 | 35072837719356 |
| 24 | 140363923730474 |
| 25 | 561697985182654 |