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 | 12 |
| 2 | 92 |
| 3 | 470 |
| 4 | 2020 |
| 5 | 7456 |
| 6 | 24962 |
| 7 | 76736 |
| 8 | 221156 |
| 9 | 602200 |
| 10 | 1565088 |
| 11 | 3902344 |
| 12 | 9389022 |
| 13 | 21876192 |
| 14 | 49542464 |
| 15 | 109333520 |
| 16 | 235717092 |
| 17 | 497416856 |
| 18 | 1029271544 |
| 19 | 2091480776 |
| 20 | 4179123296 |
| 21 | 8220922592 |
| 22 | 15937506968 |
| 23 | 30477650240 |
| 24 | 57540075230 |
| 25 | 107327212780 |
| 26 | 197923648864 |