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 | 5 |
| 1 | 20 |
| 2 | 71 |
| 3 | 207 |
| 4 | 556 |
| 5 | 1390 |
| 6 | 3310 |
| 7 | 7576 |
| 8 | 16807 |
| 9 | 36331 |
| 10 | 76850 |
| 11 | 159575 |
| 12 | 326092 |
| 13 | 657124 |
| 14 | 1307992 |
| 15 | 2575180 |
| 16 | 5020570 |
| 17 | 9702043 |
| 18 | 18599391 |
| 19 | 35397328 |
| 20 | 66918850 |
| 21 | 125738650 |
| 22 | 234930380 |
| 23 | 436660010 |
| 24 | 807690455 |
| 25 | 1487269940 |
| 26 | 2727149885 |
| 27 | 4981046893 |