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 | 13 |
| 2 | 104 |
| 3 | 637 |
| 4 | 3276 |
| 5 | 14820 |
| 6 | 60697 |
| 7 | 229372 |
| 8 | 810654 |
| 9 | 2706366 |
| 10 | 8600501 |
| 11 | 26173966 |
| 12 | 76654656 |
| 13 | 216903064 |
| 14 | 594973106 |
| 15 | 1586553501 |
| 16 | 4122693185 |
| 17 | 10461067253 |
| 18 | 25967050382 |
| 19 | 63154957281 |
| 20 | 150708128116 |
| 21 | 353304272945 |
| 22 | 814564136529 |
| 23 | 1848834255034 |
| 24 | 4134822087942 |