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 | 10 |
| 3 | 19 |
| 4 | 190 |
| 5 | 442 |
| 6 | 4420 |
| 7 | 11395 |
| 8 | 113950 |
| 9 | 312814 |
| 10 | 3128140 |
| 11 | 8960878 |
| 12 | 89608780 |
| 13 | 264735892 |
| 14 | 2647358920 |
| 15 | 8006545891 |
| 16 | 80065458910 |
| 17 | 246643289830 |
| 18 | 2466432898300 |
| 19 | 7711583225338 |
| 20 | 77115832253380 |
| 21 | 244082045341036 |
| 22 | 2440820453410360 |
| 23 | 7805301802531534 |