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 | 1 |
| 2 | 12 |
| 3 | 56 |
| 4 | 260 |
| 5 | 992 |
| 6 | 1976 |
| 7 | 2156 |
| 8 | 2754 |
| 9 | 16256 |
| 10 | 25232 |
| 11 | 41072 |
| 12 | 133984 |
| 13 | 145888 |
| 14 | 1100864 |
| 15 | 1270208 |
| 16 | 1439552 |
| 17 | 2237888 |
| 18 | 4729664 |
| 19 | 67100672 |
| 20 | 75398912 |
| 21 | 171627376 |
| 22 | 277060144 |
| 23 | 473089984 |
| 24 | 538178048 |
| 25 | 558585344 |
| 26 | 629225984 |
| 27 | 1192258048 |
| 28 | 1863840112 |
| 29 | 2181070592 |
| 30 | 4534854656 |