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 | 2 |
| 2 | 8 |
| 3 | 34 |
| 4 | 140 |
| 5 | 571 |
| 6 | 2328 |
| 7 | 9496 |
| 8 | 38740 |
| 9 | 158045 |
| 10 | 644761 |
| 11 | 2630364 |
| 12 | 10730820 |
| 13 | 43777405 |
| 14 | 178594110 |
| 15 | 728591751 |
| 16 | 2972359720 |
| 17 | 12126025705 |
| 18 | 49469281395 |
| 19 | 201814663875 |
| 20 | 823322219501 |
| 21 | 3358821723401 |
| 22 | 13702634402876 |
| 23 | 55901207340276 |
| 24 | 228054320813276 |
| 25 | 930369409108152 |