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 | 6 |
| 2 | 18 |
| 3 | 92 |
| 4 | 298 |
| 5 | 1444 |
| 6 | 4852 |
| 7 | 22840 |
| 8 | 78490 |
| 9 | 362580 |
| 10 | 1265564 |
| 11 | 5767688 |
| 12 | 20366596 |
| 13 | 91866984 |
| 14 | 327351336 |
| 15 | 1464522864 |
| 16 | 5257011066 |
| 17 | 23361650484 |
| 18 | 84371466636 |
| 19 | 372831130344 |
| 20 | 1353477992556 |
| 21 | 5952169844664 |
| 22 | 21704580414936 |
| 23 | 95051752387344 |