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 | 4 |
| 2 | 14 |
| 3 | 52 |
| 4 | 210 |
| 5 | 816 |
| 6 | 3206 |
| 7 | 12536 |
| 8 | 48962 |
| 9 | 191226 |
| 10 | 746456 |
| 11 | 2913544 |
| 12 | 11371040 |
| 13 | 44376798 |
| 14 | 173181564 |
| 15 | 675834086 |
| 16 | 2637392942 |
| 17 | 10292179494 |
| 18 | 40164144690 |
| 19 | 156736057740 |
| 20 | 611644171812 |
| 21 | 2386868430698 |
| 22 | 9314465669046 |