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) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 84 |
| 4 | 292 |
| 5 | 912 |
| 6 | 2812 |
| 7 | 8928 |
| 8 | 28152 |
| 9 | 87972 |
| 10 | 277292 |
| 11 | 872524 |
| 12 | 2738692 |
| 13 | 8615772 |
| 14 | 27093728 |
| 15 | 85142632 |
| 16 | 267722916 |
| 17 | 841747760 |
| 18 | 2646047052 |
| 19 | 8319199464 |
| 20 | 26155059448 |
| 21 | 82225749476 |
| 22 | 258510349884 |
| 23 | 812729058372 |
| 24 | 2555098454212 |
| 25 | 8032934120092 |