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 | 40 |
| 4 | 109 |
| 5 | 276 |
| 6 | 682 |
| 7 | 1624 |
| 8 | 3810 |
| 9 | 8744 |
| 10 | 19868 |
| 11 | 44496 |
| 12 | 98941 |
| 13 | 217780 |
| 14 | 476786 |
| 15 | 1036024 |
| 16 | 2241814 |
| 17 | 4823160 |
| 18 | 10342180 |
| 19 | 22076080 |
| 20 | 46994386 |
| 21 | 99673224 |
| 22 | 210923364 |
| 23 | 445000560 |
| 24 | 937051684 |
| 25 | 1968204496 |
| 26 | 4127285688 |
| 27 | 8636324768 |
| 28 | 18045851165 |
| 29 | 37638105588 |
| 30 | 78404375362 |