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 | 2 |
| 1 | 25 |
| 2 | 140 |
| 3 | 540 |
| 4 | 1666 |
| 5 | 4417 |
| 6 | 10480 |
| 7 | 22825 |
| 8 | 46420 |
| 9 | 89232 |
| 10 | 163592 |
| 11 | 288015 |
| 12 | 489580 |
| 13 | 806990 |
| 14 | 1294448 |
| 15 | 2026502 |
| 16 | 3104030 |
| 17 | 4661555 |
| 18 | 6876100 |
| 19 | 9977814 |
| 20 | 14262622 |
| 21 | 20107175 |
| 22 | 27986400 |
| 23 | 38493975 |
| 24 | 52366080 |
| 25 | 70508802 |